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A141445
Number of n X n integer matrices, symmetric under 180 degree rotation, with adjacent elements differing by no more than 1, counting matrices differing by a constant only once.
0
1, 3, 45, 597, 42787, 2695803, 923529659, 278451121903, 457744547778601, 663065487350675885
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A060242
A271236
A270064
*
A076140
A131568
A287031
Adjacent sequences:
A141442
A141443
A141444
*
A141446
A141447
A141448
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Aug 06 2008
STATUS
approved
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Last modified September 16 23:59 EDT 2024. Contains 375984 sequences. (Running on oeis4.)