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A146515
Number of n X n arrays of squares of integers summing to 21 with every element equal to at least one neighbor.
1
0, 92, 17216, 5077564, 1460980380, 540147070759, 87704130371420
OFFSET
2,2
CROSSREFS
Sequence in context: A267734 A146503 A252593 * A252631 A191948 A278860
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 14 2009
STATUS
approved