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A156521 Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 64. 0
1, 0, 0, 3, 7, 132, 3039, 751770, 20902434, 14753635250 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..10.

CROSSREFS

Sequence in context: A079622 A182330 A005844 * A012636 A006031 A219166

Adjacent sequences:  A156518 A156519 A156520 * A156522 A156523 A156524

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 09 2009

STATUS

approved

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Last modified May 30 11:52 EDT 2020. Contains 334724 sequences. (Running on oeis4.)