#include <bits/stdc++.h>
using namespace std ;

template <typename T>
T inverse(T a, T m) {
  T u = 0, v = 1;
  while (a != 0) {
    T t = m / a;
    m -= t * a; swap(a, m);
    u -= t * v; swap(u, v);
  }
  assert(m == 1);
  return u;
}

template <typename T>
class Modular {
 public:
  using Type = typename decay<decltype(T::value)>::type;

  constexpr Modular() : value() {}
  template <typename U>
  Modular(const U& x) {
    value = normalize(x);
  }

  template <typename U>
  static Type normalize(const U& x) {
    Type v;
    if (-mod() <= x && x < mod()) v = static_cast<Type>(x);
    else v = static_cast<Type>(x % mod());
    if (v < 0) v += mod();
    return v;
  }

  const Type& operator()() const { return value; }
  template <typename U>
  explicit operator U() const { return static_cast<U>(value); }
  constexpr static Type mod() { return T::value; }

  Modular& operator+=(const Modular& other) { if ((value += other.value) >= mod()) value -= mod(); return *this; }
  Modular& operator-=(const Modular& other) { if ((value -= other.value) < 0) value += mod(); return *this; }
  template <typename U> Modular& operator+=(const U& other) { return *this += Modular(other); }
  template <typename U> Modular& operator-=(const U& other) { return *this -= Modular(other); }
  Modular& operator++() { return *this += 1; }
  Modular& operator--() { return *this -= 1; }
  Modular operator++(int) { Modular result(*this); *this += 1; return result; }
  Modular operator--(int) { Modular result(*this); *this -= 1; return result; }
  Modular operator-() const { return Modular(-value); }

  template <typename U = T>
  typename enable_if<is_same<typename Modular<U>::Type, int>::value, Modular>::type& operator*=(const Modular& rhs) {
#ifdef _WIN32
    uint64_t x = static_cast<int64_t>(value) * static_cast<int64_t>(rhs.value);
    uint32_t xh = static_cast<uint32_t>(x >> 32), xl = static_cast<uint32_t>(x), d, m;
    asm(
      "divl %4; \n\t"
      : "=a" (d), "=d" (m)
      : "d" (xh), "a" (xl), "r" (mod())
    );
    value = m;
#else
    value = normalize(static_cast<int64_t>(value) * static_cast<int64_t>(rhs.value));
#endif
    return *this;
  }
  template <typename U = T>
  typename enable_if<is_same<typename Modular<U>::Type, int64_t>::value, Modular>::type& operator*=(const Modular& rhs) {
    int64_t q = static_cast<int64_t>(static_cast<long double>(value) * rhs.value / mod());
    value = normalize(value * rhs.value - q * mod());
    return *this;
  }
  template <typename U = T>
  typename enable_if<!is_integral<typename Modular<U>::Type>::value, Modular>::type& operator*=(const Modular& rhs) {
    value = normalize(value * rhs.value);
    return *this;
  }

  Modular& operator/=(const Modular& other) { return *this *= Modular(inverse(other.value, mod())); }

  template <typename U>
  friend bool operator==(const Modular<U>& lhs, const Modular<U>& rhs);

  template <typename U>
  friend bool operator<(const Modular<U>& lhs, const Modular<U>& rhs);

  template <typename U>
  friend std::istream& operator>>(std::istream& stream, Modular<U>& number);

 private:
  Type value;
};

template <typename T> bool operator==(const Modular<T>& lhs, const Modular<T>& rhs) { return lhs.value == rhs.value; }
template <typename T, typename U> bool operator==(const Modular<T>& lhs, U rhs) { return lhs == Modular<T>(rhs); }
template <typename T, typename U> bool operator==(U lhs, const Modular<T>& rhs) { return Modular<T>(lhs) == rhs; }

template <typename T> bool operator!=(const Modular<T>& lhs, const Modular<T>& rhs) { return !(lhs == rhs); }
template <typename T, typename U> bool operator!=(const Modular<T>& lhs, U rhs) { return !(lhs == rhs); }
template <typename T, typename U> bool operator!=(U lhs, const Modular<T>& rhs) { return !(lhs == rhs); }

template <typename T> bool operator<(const Modular<T>& lhs, const Modular<T>& rhs) { return lhs.value < rhs.value; }

template <typename T> Modular<T> operator+(const Modular<T>& lhs, const Modular<T>& rhs) { return Modular<T>(lhs) += rhs; }
template <typename T, typename U> Modular<T> operator+(const Modular<T>& lhs, U rhs) { return Modular<T>(lhs) += rhs; }
template <typename T, typename U> Modular<T> operator+(U lhs, const Modular<T>& rhs) { return Modular<T>(lhs) += rhs; }

template <typename T> Modular<T> operator-(const Modular<T>& lhs, const Modular<T>& rhs) { return Modular<T>(lhs) -= rhs; }
template <typename T, typename U> Modular<T> operator-(const Modular<T>& lhs, U rhs) { return Modular<T>(lhs) -= rhs; }
template <typename T, typename U> Modular<T> operator-(U lhs, const Modular<T>& rhs) { return Modular<T>(lhs) -= rhs; }

template <typename T> Modular<T> operator*(const Modular<T>& lhs, const Modular<T>& rhs) { return Modular<T>(lhs) *= rhs; }
template <typename T, typename U> Modular<T> operator*(const Modular<T>& lhs, U rhs) { return Modular<T>(lhs) *= rhs; }
template <typename T, typename U> Modular<T> operator*(U lhs, const Modular<T>& rhs) { return Modular<T>(lhs) *= rhs; }

template <typename T> Modular<T> operator/(const Modular<T>& lhs, const Modular<T>& rhs) { return Modular<T>(lhs) /= rhs; }
template <typename T, typename U> Modular<T> operator/(const Modular<T>& lhs, U rhs) { return Modular<T>(lhs) /= rhs; }
template <typename T, typename U> Modular<T> operator/(U lhs, const Modular<T>& rhs) { return Modular<T>(lhs) /= rhs; }

template<typename T, typename U>
Modular<T> power(const Modular<T>& a, const U& b) {
  assert(b >= 0);
  Modular<T> x = a, res = 1;
  U p = b;
  while (p > 0) {
    if (p & 1) res *= x;
    x *= x;
    p >>= 1;
  }
  return res;
}

template <typename T>
string to_string(const Modular<T>& number) {
  return to_string(number());
}

template <typename T>
std::ostream& operator<<(std::ostream& stream, const Modular<T>& number) {
  return stream << number();
}

template <typename T>
std::istream& operator>>(std::istream& stream, Modular<T>& number) {
  typename common_type<typename Modular<T>::Type, int64_t>::type x;
  stream >> x;
  number.value = Modular<T>::normalize(x);
  return stream;
}

/*
using ModType = int;

struct VarMod { static ModType value; };
ModType VarMod::value;
ModType& md = VarMod::value;
using Mint = Modular<VarMod>;
*/

constexpr int md = 998244353 ;
using Mint = Modular<std::integral_constant<decay<decltype(md)>::type, md>>;

int step = 500 ;
Mint dp0[520][200010] ;
Mint dp1[520][200010] ;
Mint fac[200010] ;
Mint ddiv[200010] ;
Mint f[200010] ;

Mint dfs0( int n ,int m ){
  if( m < 0 ) return 0 ;
  if( m == 0 ) return 1 ;
  if( dp0[m/step][n] != 0 ) return dp0[m/step][n] ;
  if( n == m + 1 ) return f[n] + f[n-1] ;
  if( n == m ) return f[n] ;
//  return dp0[n/500][m] = dfs0(n,m-1) * (n-2*m+1) + dfs0(n,m-2)*(n-m+2)*(m-1) ;
  return dp0[m/step][n] = (dfs0(n-1,m)*(n+1) - dfs0(n-2,m)) * ddiv[n-m] ;
}
Mint dfs1( int n ,int m ){
  if( m < 0 ) return 0 ;
  if( m == 0 ) return 1 ;
  if( dp1[m/step][n] != 0 ) return dp1[m/step][n] ;
  if( n == m + 1 ) return f[n] + f[n-1] ;
  if( n == m ) return f[n] ;
  return dp1[m/step][n] = (dfs1(n-1,m)*(n+1) - dfs1(n-2,m)) * ddiv[n-m] ;
//  return dp1[n/500][m] = dfs1(n,m-1) * (n-2*m+1) + dfs1(n,m-2)*(n-m+2)*(m-1) ;
}



/*
Mint dfs1( int n ,int m ){
  if( m < 0 ) return 0 ;
  if( m == 0 ) return 1 ;
  if( tmp[n] != 0 ) return dp[n] ;
  if( n == m + 1 ) return f[n] + f[n-1] ;
  if( n == m ) return f[n] ;
  return tmp[n] = (dfs1(n-1,m)*(n+1) - dfs1(n-2,m)) / (n-m) ;
}*/

int main(){
  std::ios::sync_with_stdio(false);
  std::cin.tie(0);
  int n ,m ;
  fac[0] = 1 ;
  for( int i = 1 ;i <= 200000 ;i ++ )
    fac[i] = fac[i-1] * i ;
  for( int i = 2 ;i <= 200000 ;i ++ ) f[i] = f[i-1] * i + (i%2?-1:1) ;
  for( int i = 1 ;i <= 200000 ;i ++ ) ddiv[i] = Mint(1)/i ;
  for( int i = 0 ;i <= 200000 ;i += step ){
    for( int j = i ;j <= 200000 ;j ++ )
      dp0[i/step][j] = dfs0( j ,i ) ;

    for( int j = i+1 ;j <= 200000 ;j ++ )
      dp1[i/step][j] = dfs1( j ,i+1 ) ;
  }
  auto c = [&]( int a ,int b ){ return fac[a] / fac[b] / fac[a-b] ; } ;
  int T ;
  cin >> T ;
  while( T -- ){
    cin >> n >> m ;
    if( m * 2 > n ){
      cout << 0 << endl ;
      continue ;
    }
    Mint ans ,a0 ,a1 ;
    int s = (n-m-m)/step ;
    a0 = dp0[s][n-m] ;
    a1 = dp1[s][n-m] ;
    if( s * step == n - m - m ) ans = dp0[s][n-m] ;
    if( s * step + 1 == n - m - m ) ans = dp1[s][n-m] ;
    s = s*step+2 ;
    for( int i = s ;i <= n-m-m ;i ++ ){
      ans = a1 * ( n - m - 2 * i + 1 ) + a0 * ( n - m - i + 2 ) * ( i - 1 ) ;
      a0 = a1 ;
      a1 = ans ;
    }
    cout << ans * fac[m] * c(n-m,m) * fac[m] << endl ;
  }
//  cout << dfs( n-m ,n-m-m ) * fac[m] * c(n-m,m) * fac[m] << endl ;

}