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.
First non-zero element in each column
Replace all zeros and NaNs in a matrix with the string 'error'
Is it a number?
Is this triangle right-angled?
Sum my indices
All your base are belong to us
So many choices
High school cafeteria
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