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A156514
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 51.
0
5, 116, 452, 60568, 662388, 382580208, 13757627936, 22555562198752
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OFFSET
3,1
LINKS
Table of n, a(n) for n=3..10.
CROSSREFS
Sequence in context:
A245105
A080988
A230338
*
A319392
A268606
A006221
Adjacent sequences:
A156511
A156512
A156513
*
A156515
A156516
A156517
KEYWORD
nonn
AUTHOR
R. H. Hardin
Feb 09 2009
STATUS
approved
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Last modified April 25 07:41 EDT 2024. Contains 371964 sequences. (Running on oeis4.)