Square a number
I would recommend more test cases, including some of matrices.
This user (ALBERT ALEXANDER STONIER) appears to have gamed the system, with fraudulent "likes" of this unremarkable solution submitted by 'sock-puppet' accounts. —DIV
Return the 3n+1 sequence for n
Sum all integers from 1 to 2^n
Multiply a column by a row
Change the sign of even index entries of the reversed vector
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