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Four of the first 5 values are primes, up through this one, of partial sums of number of inequivalent ways of choosing n squares from an n-by-n board, considering rotations and reflections to be the same. After these (3, 19, 271, 251429) there are no more through 20-by-20. [Post]


  Submitted: 2010-03-03 01:29:09;   Last Modified: 2010-03-03 10:12:45.

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