(Answer)th Triangular Number. ITN = Iterated Triangular Number Here's how it works (in an easy way): We take 2 (not 1. You'll find out later). Then, we think: "the 2nd triangular number is...3."Then we take 3. We think "The third triangular number is...6."Then 6, which ends up with 21, since it's the 6th triangular number. Then 21, 231, etc. Or you can just look at the formula later on the project
