1's Square = 1 / 6 * 2 * 3; 1's square + 2's Square = 2 / 6 * 3 * 5; 1's square + 2's square + 3's Square = 3 / 6 * 4 * 7

1's Square = 1 / 6 * 2 * 3; 1's square + 2's Square = 2 / 6 * 3 * 5; 1's square + 2's square + 3's Square = 3 / 6 * 4 * 7

1^2=1*2*3/6
1^2+2^2=2*3*5/6
1^2+2^2+3^2=3*4*7/6
1^2+2^2+3^2+...+n^2=n(n+1)(2n+1)/6
!