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.
Which doors are open?
Tic Tac Toe FTW
given 3 sides, find area of this triangle
High school cafeteria
The Hitchhiker's Guide to MATLAB
Factorize THIS, buddy
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