you were the first to find this?! if so, pic reel ate it
what is it that makes you attribute this post to Q, since it does not say Q anywhere in the post?
don't know if anyone's pointed this out yet, so i will. "The nth tetrahedral number is the sum of the first n triangular numbers. The first ten tetrahedral numbers are: 1, 4, 10, 20, 35, 56, 84, 120, 165, 220,