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A146300
Number of n X n arrays of squares of integers summing to 9 with every element equal to at least one neighbor.
1
0, 1, 1640, 123744, 1546356, 9282128, 37896264, 121782952, 331901924, 801191922, 1761200680, 3592793804, 6894127812, 12569395174
OFFSET
2,3
CROSSREFS
Sequence in context: A234986 A043464 A002434 * A035866 A015340 A272127
KEYWORD
nonn
AUTHOR
R. H. Hardin, Apr 14 2009
STATUS
approved