Generate a matrix like abelian sandpile where the center of the matrix is n.

For example, n=3

 out=[0     0     0     0     0     0     0
      0     1     1     1     1     1     0
      0     1     2     2     2     1     0
      0     1     2     3     2     1     0
      0     1     2     2     2     1     0
      0     1     1     1     1     1     0
      0     0     0     0     0     0     0]
Solve

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Last Solution submitted on Sep 18, 2026

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Chris Cleveland George Berken Alexander Ross Lorenzo

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