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A156515 Number of nXn arrays of squares of integers, symmetric about main diagonal, with all rows summing to 52. 0
2, 6, 134, 10554, 5819580, 9898523036, 72477416788308, 2085565005226231500 (list; graph; refs; listen; history; internal format)
OFFSET

2,1

CROSSREFS

Sequence in context: A060001 A181316 A101753 * A090907 A159478 A047937

Adjacent sequences:  A156512 A156513 A156514 * A156516 A156517 A156518

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Feb 09 2009

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Last modified February 14 13:08 EST 2012. Contains 205623 sequences.