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Number of n X n arrays of squares of integers summing to 21 with every element equal to at least one neighbor.
1

%I #4 Dec 18 2015 18:17:15

%S 0,92,17216,5077564,1460980380,540147070759,87704130371420

%N Number of n X n arrays of squares of integers summing to 21 with every element equal to at least one neighbor.

%K nonn

%O 2,2

%A _R. H. Hardin_ Apr 14 2009