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.
Word Counting and Indexing
pressure to dB?
QWERTY Shift Code Decoder
Calculate a Damped Sinusoid
Label primes with the Erdos-Selfridge classification
Solve an ODE: equation A
Count the ways pairs of parentheses can be matched correctly
Multiply binary numbers
Locate a family on a long street
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