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.
Most nonzero elements in row
Make a random, non-repeating vector.
Sum the Digits of a Number
Is this triangle right-angled?
Construct finite difference approximations of derivatives
Find jumping medalists
Compute the date of a special marriage milestone
Determine digits of the Copeland-Erdos constant
Identify primorial primes
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