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A156504
Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 40.
0
2, 0, 32, 114, 16570, 196824, 116949508, 3753914276, 4711859922047
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OFFSET
2,1
LINKS
Table of n, a(n) for n=2..10.
CROSSREFS
Sequence in context:
A176726
A156452
A156473
*
A340545
A009665
A053552
Adjacent sequences:
A156501
A156502
A156503
*
A156505
A156506
A156507
KEYWORD
nonn
AUTHOR
R. H. Hardin
Feb 09 2009
STATUS
approved
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Last modified March 29 09:59 EDT 2024. Contains 371268 sequences. (Running on oeis4.)