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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
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OFFSET
1,4
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A182330
A005844
A347515
*
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 13 17:28 EDT 2024. Contains 372522 sequences. (Running on oeis4.)