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A156468
Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 18.
0
1, 8, 114, 3704, 285470, 46859304, 17604991124, 15033533213232, 35207864619957092
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OFFSET
2,2
LINKS
Table of n, a(n) for n=2..10.
CROSSREFS
Sequence in context:
A220635
A113670
A347019
*
A293992
A220575
A240890
Adjacent sequences:
A156465
A156466
A156467
*
A156469
A156470
A156471
KEYWORD
nonn
AUTHOR
R. H. Hardin
Feb 09 2009
STATUS
approved
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Last modified June 4 17:49 EDT 2024. Contains 373102 sequences. (Running on oeis4.)