The test case result for n=5 seems a tad high.
Tim, that last case is altperm(altperm(5)). I did that to discourage lookup solutions.
Make a checkerboard matrix
Is it column vector?
Where is the number that you want to find?
Check if number is a square number
Identify eban numbers
List prime anagrams of a number
Solve a nonlinear difference equation
Compute a row of the Kimberling shuffle
Solve an ODE: separable equation
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