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A156509 Number of nXn arrays of squares of integers, symmetric about main diagonal, with all rows summing to 45. +0
1
2, 12, 390, 12963, 1881506, 1336889688, 9293294524192, 249490585063875516 (list; graph; listen)
OFFSET

2,1
CROSSREFS

Sequence in context: A012547 A009706 A012551 this_sequence A051009 A060942 A072446

Adjacent sequences: A156506 A156507 A156508 this_sequence A156510 A156511 A156512

KEYWORD

nonn

AUTHOR

Ron Hardin (rhhardin(AT)att.net) Feb 09 2009

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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