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A156470 Number of nXn arrays of squares of integers, symmetric about main diagonal, with all rows summing to 19. 0
4, 68, 1844, 313880, 91441740, 58741831848, 78227960348272, 210460779796568160 (list; graph; refs; listen; history; internal format)
OFFSET

3,1

CROSSREFS

Sequence in context: A141032 A156084 A000658 * A009473 A009520 A009791

Adjacent sequences:  A156467 A156468 A156469 * A156471 A156472 A156473

KEYWORD

nonn

AUTHOR

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

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Last modified February 15 19:15 EST 2012. Contains 205852 sequences.