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A156526
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 81.
0
1, 2, 8, 184, 772, 77184, 641136, 2194362732
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context:
A317794
A009377
A181234
*
A009505
A305737
A028368
Adjacent sequences:
A156523
A156524
A156525
*
A156527
A156528
A156529
KEYWORD
nonn
AUTHOR
R. H. Hardin
Feb 09 2009
STATUS
approved
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Last modified March 19 06:56 EDT 2024. Contains 370953 sequences. (Running on oeis4.)