A beautiful problem from a Hungarian competition

Probability Level 4

We need to fill each cell in a 6×66\times6 grid with a distinct integer from 1 to 36. There are two rules:

  • Every pair of consecutive numbers are in adjacent cells that share an edge.
  • Any two cells containing a multiple of 4 cannot share an edge nor a vertex.

Over all valid configurations, how many of the 36 cells could contain the number 36?36?

Note: Below is a 3×33\times 3 grid adhering to the rules above.


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