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A156462
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 15.
0
22, 0, 3200, 2952, 1651208, 6328576, 2727888448, 31390349120, 15449498784320, 512365063156800
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OFFSET
4,1
LINKS
Table of n, a(n) for n=4..13.
CROSSREFS
Sequence in context:
A225343
A252670
A297813
*
A040488
A040489
A040490
Adjacent sequences:
A156459
A156460
A156461
*
A156463
A156464
A156465
KEYWORD
nonn
AUTHOR
R. H. Hardin
Feb 09 2009
STATUS
approved
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Last modified May 16 20:35 EDT 2024. Contains 372555 sequences. (Running on oeis4.)