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A146521
Number of n X n arrays of squares of integers summing to 27 with every element equal to at least one neighbor.
1
0, 36, 25148, 18912868, 9700090280, 6565665508942
OFFSET
2,2
CROSSREFS
Sequence in context: A001308 A067584 A308423 * A159431 A028454 A159435
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 14 2009
STATUS
approved