Unless I'm screwing something up, I think there are three possible answers to this question, and you're looking for the integer one? Given the answers you are looking for, A and C are always the triangles that have one full side of your square, but that's not specified in the problem statement.
I took the scenic route.
Back to basics 8 - Matrix Diagonals
Create incrementing array
Sum of series VII
Flip the vector from right to left
convert between ascii and characters
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