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.
Remove the vowels
Size of this cup?
Back to basics 6 - Column Vector
Find out missing number from a vector of 9 elements
Are you in or are you out?
Tune your guitar
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