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A156503 Number of nXn arrays of squares of integers, symmetric about main diagonal, with all rows summing to 40. +0
1
2, 6, 60, 2914, 1216320, 1982323016, 10802428568204, 144294430454318540 (list; graph; listen)
OFFSET

2,1
CROSSREFS

Sequence in context: A108640 A084971 A001577 this_sequence A077175 A139771 A129665

Adjacent sequences: A156500 A156501 A156502 this_sequence A156504 A156505 A156506

KEYWORD

nonn

AUTHOR

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

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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