#include using namespace std; using ll = long long; #include using mint = atcoder::modint998244353; const int mx = 1<<17; mint fac[mx+1],ifac[mx+1]; int main(){ cin.tie(nullptr); ios::sync_with_stdio(false); fac[0] = 1; for(int i = 1;i<=mx;i++) fac[i] = fac[i-1] * i; for(int i = 0;i<=mx;i++) ifac[i] = fac[i].inv(); int n; cin>>n; int m = 2 * n + 1; vector> dp(m+1,vector(m+1,0)); dp[0][0] = 1; for(int i = 0;i