啊题解

#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
cin >> n;
while(n--){
int k;
cin >> k;
long long a[10005] = {};
a[1] = 2;
for(int i = 2; i <= k; i++) {
a[i] = a[i - 1] + (i - 1) * 2;
}
cout << a[k] << endl;
}

return 0;

}