As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Create a matrix X, where each column is a shifted copy of the vector v
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Count up then down
Magic is simple (for beginners)
05 - Vector Equations 2
Modify subscripts - easier
How many solutions has this problem?
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