Check whether the input matrix is a figurate number triangle: http://mathworld.wolfram.com/FigurateNumberTriangle.html
you should probably add a test case where the correct answer is false.
I added a few more tests as suggested.
DNA N-Gram Distribution
Project Euler: Problem 8, Find largest product in a large string of numbers
Back to basics 11 - Max Integer
Sum of diagonals elements of a matrix
Maintain shape of logical-index mask
Tune your guitar
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