#include <iostream>
using namespace std;

int friendsPairing(int n){
    //Base case
    if(n==0 || n==1)
    return 1;
    
    //Recursive case
    else return friendsPairing(n-1)+ (friendsPairing(n-2)* (n-1));
}

int main() {
    int t;
    cin>>t;
    while(t--) {
     int n;
     cin>>n;
     cout<<friendsPairing(n)<<endl;
    }
	return 0;
}