I think that with this kind of problem, you can process in two steps.
A first easy problem with small N (to test perms for example). And a harder problem with big N, which
oblige to find another algorithm.
Find matching parenthesis
2 b | ~ 2 b
middleAsColumn: Return all but first and last element as a column vector
Find number of days
A matrix of introverts
Points on a circle.
Golomb's self-describing sequence (based on Euler 341)
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