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
Find Rotated Substring
Is the Point in a Triangle?
Solve a ballot counting problem
Compute an improper integral of a ratio of algebraic functions
Locate a family on a long street
List the dihedral primes
Compute the nth Pythagorean prime
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