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A156443
Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 7.
0
10, 240, 12160, 804511, 81439488, 10953612400, 2077266004944, 566459875724280, 241889456638665264
OFFSET
4,1
CROSSREFS
Sequence in context: A067423 A221099 A171204 * A211088 A064757 A087435
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 09 2009
STATUS
approved