Need a better test suite to prevent cheesy solutions like this one. :-) Some N>10 values in there would help. N>50 would be even better.
Back to basics 22 - Rotate a matrix
Rotate a Matrix
Find out the Gray Code for a Given Binary Number
Number of even divisors of a given number
Make a rainbow matrix (follow-up to checkerboard matrix)
Under the sea: Snell's law & total internal reflection
Fractal: area and perimeter of Koch snowflake
Number of paths on a 3d grid
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