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.
Tune your guitar
middleAsColumn: Return all but first and last element as a column vector
How many trades represent all the profit?
Add more zeros
The Dark Side of the Die
Maintain shape of logical-index mask
Flip the bit
Increment a number, given its digits
All your base are belong to us
So many choices
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