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.
Replace NaNs with the number that appears to its left in the row.
Project Euler: Problem 4, Palindromic numbers
Convert a vector into a number
Set some matrix elements to zero
Solve the Challenger puzzle
Set Soldner's constant
List the dihedral primes
List the delete-a-digit primes
Compute expulsions from the Kimberling shuffle
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