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Problem 18 asks to create a bullseye matrix like this:

[ 3 3 3 3 3 3 2 2 2 3 3 2 1 2 3 3 2 2 2 3 3 3 3 3 3 ]

But I think a better one would look like this:

[ 5 4 3 4 5 4 3 2 3 4 3 2 1 2 3 4 3 2 3 4 5 4 3 4 5 ]

Thus given n (always odd), return output a that has concentric rings of the numbers 1 through n around the center point.

114 correct solutions
42 incorrect solutions

Last solution submitted on May 25, 2015