51nod_1639:绑鞋带

题目链接：https://www.51nod.com/onlineJudge/questionCode.html#!problemId=1639

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

];

int main()
{
    ans[]=;
    ;i<=;i++)
        ans[i]=ans[i-]**(i-)/(*i-);

    int n;
    while(cin>>n)
        cout<<ans[n]<<endl;
}