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.
Angle between Two Vectors
sum of first 'n' terms
05 - Vector Equations 1
Create a two dimensional zero matrix
So many choices
Maintain shape of logical-index mask
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