#include <stdio.h>

int main()
{
	int i, t, T, N;
	long long ans[1000001] = {};
	for (N = 3, ans[2] = 0, ans[1] = 0; N <= 1000000; N++) ans[N] = ans[N-1] + (long long)(N - 1) * (N - 2);
	scanf("%d", &T);
	for (t = 1; t <= T; t++) {
		scanf("%d", &N);
		printf("%lld\n", ans[N] * 2);
	}
	fflush(stdout);
	return 0;
}