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Number of n X n arrays of squares of integers summing to 9 with every element equal to at least one neighbor.
1

%I #5 Jun 16 2015 14:16:30

%S 0,1,1640,123744,1546356,9282128,37896264,121782952,331901924,

%T 801191922,1761200680,3592793804,6894127812,12569395174

%N Number of n X n arrays of squares of integers summing to 9 with every element equal to at least one neighbor.

%K nonn

%O 2,3

%A _R. H. Hardin_, Apr 14 2009