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A156518 Number of nXn arrays of squares of integers, symmetric about main diagonal, with all rows summing to 61. 0
2, 12, 326, 16298, 5919644, 9055603332, 108964188487952, 6758216414353306068 (list; graph; refs; listen; history; internal format)
OFFSET

2,1

CROSSREFS

Sequence in context: A122767 A094047 A091472 * A012727 A181142 A088229

Adjacent sequences:  A156515 A156516 A156517 * A156519 A156520 A156521

KEYWORD

nonn

AUTHOR

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

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Last modified February 16 21:44 EST 2012. Contains 205977 sequences.