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.
Make a Palindrome Number
Construct a string from letters and counts
Back to basics 15 - Benchmark
Sum of diagonal of a square matrix
Replace multiples of 5 with NaN
So many choices
Is my wife right? Now with even more wrong husband
Are you in or are you out?
Tune your guitar
Sum my indices
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