A146506 - OEIS

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A146506

Number of n X n arrays of squares of integers summing to 18 with every element equal to at least one neighbor.

%I #4 Dec 18 2015 18:17:14

%S 4,90,12424,2808172,449235282,107282960684,5345302912844,

%T 102834566977650

%N Number of n X n arrays of squares of integers summing to 18 with every element equal to at least one neighbor.

%K nonn

%O 2,1

%A _R. H. Hardin_ Apr 14 2009