public class Ratsut4 {
    private static int laske(int n) {
        if (n <= 1) return 0;
        if (n == 2) return 4;
        if (n == 3) return 36;
        return (n*n*n*n*n*n-27*n*n*n*n+72*n*n*n+170*n*n-984*n+1080)/6;
    }

    public static void main(String[] args) {
        for (int i = 1; i <= 20; i++) {
            System.out.println(i + ":" + laske(i));
        }
    }
}