public static String cubos(int n) {
        String res = "";
        int auxiliar = 1;
        for (int x = 1; x < n; x++) {
            int suma = 0;
            if (x == 1) {
                res = x + "^3 = " + x + " = 1";
            }
            res += "\n";
            res += x+1 + "^3 = ";
            for (int h = 1; h <= x + 1; h++) {
                auxiliar += 2;
                suma += auxiliar;
                res += auxiliar;
                if (h <= x) res += " + ";
            }
            res += " = " + suma;
        }
        return res;
}