int[][] array = {{0}, {0, 1}, {0, 2, 4}, {0, 3, 6, 9}, {0, 4, 8, 12, 16}};
        System.out.println(array [4] [1]);
        System.out.println(array[1][4]);
        int[][] array = {{0}, {0, 1}, {0, 2, 4}, {0, 3, 6, 9}, {0, 4, 8, 12, 16}};
        System.out.println(array [4][1]);
        System.out.println(array[1][4]);