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.
given 3 sides, find area of this triangle
Set the array elements whose value is 13 to 0
Community Problem 500!
Determine whether a number is a cluster prime
Solve a Weird Calculator puzzle
Compute the harmonic numbers
Evaluate the generalized hypergeometric function
Construct the Seidel-Entringer-Arnold triangle
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