#include <bits/stdc++.h>
using namespace std;
using Int = long long;
constexpr static int mod = 1e9 + 7;
constexpr static int inf = (1 << 30) - 1;
constexpr static Int infll = (1LL << 61) - 1;
int Competitive_Programming = (ios_base::sync_with_stdio(false), cin.tie(nullptr), cout << fixed << setprecision(15), 0);
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

void solve()
{
	Int N;
	cin >> N;

	Int ans = 0;

	for (Int i = 2; i < N; i++)
		ans += i * i - i;

	cout << 2 * ans << "\n";
}

int main()
{
	int t;
	cin >> t;
	while (t--)
		solve();
}