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A156445 Number of nXn arrays of squares of integers, symmetric about main diagonal, with all rows summing to 8. 0
1, 4, 18, 138, 3910, 446508, 89959563, 25250999564, 10095521906313, 5572579847718200, 4311704697906480578 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

CROSSREFS

Sequence in context: A034517 A194559 A065857 * A060841 A059837 A054759

Adjacent sequences:  A156442 A156443 A156444 * A156446 A156447 A156448

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 14:47 EST 2012. Contains 205623 sequences.