来占个楼，打表过的

#include<bits/stdc++.h>

using namespace std;

int main(){
int b,a[1000]={1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 9694845, 35357670, 129644790, 477638700, 1767263190, 6564120420, 24466267020, 91482563640, 343059613650, 1289904147324, 4861946401452};
cin>>b;
cout<<a[b];
return 0;
}