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A156487
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 27.
0
3, 58, 204, 13400, 102762, 19311868, 365142544, 166203280736, 6303614816380
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OFFSET
3,1
LINKS
Table of n, a(n) for n=3..11.
CROSSREFS
Sequence in context:
A037107
A335293
A041735
*
A254653
A243510
A024218
Adjacent sequences:
A156484
A156485
A156486
*
A156488
A156489
A156490
KEYWORD
nonn
AUTHOR
R. H. Hardin
Feb 09 2009
STATUS
approved
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Last modified July 14 02:38 EDT 2024. Contains 374291 sequences. (Running on oeis4.)