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.
Are you in or are you out?
Triangle Numbers Below N
Make a random, non-repeating vector.
Combinations without using nchoosek
Compute expulsions from the Kimberling shuffle
List the good primes
Compute the largest number whose prime factors sum to n
Characterize the final state of another digit inventory sequence
Solve the Challenger puzzle
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