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A156471
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 19.
0
2, 28, 76, 6024, 39000, 4562152, 61580624, 13526490400, 338077231956, 183471645987760
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OFFSET
3,1
LINKS
Table of n, a(n) for n=3..12.
CROSSREFS
Sequence in context:
A336464
A245801
A296245
*
A329595
A138964
A200040
Adjacent sequences:
A156468
A156469
A156470
*
A156472
A156473
A156474
KEYWORD
nonn
AUTHOR
R. H. Hardin
Feb 09 2009
STATUS
approved
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Last modified March 28 10:31 EDT 2024. Contains 371240 sequences. (Running on oeis4.)