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A145247
1/6 of the number of 6-colorings of an n X n array symmetric under 180 degree rotation.
0
1, 5, 445, 38945, 61129245, 94304065705, 2610924486436445, 71050577480317387425
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context:
A038003
A359992
A054332
*
A317345
A333263
A212042
Adjacent sequences:
A145244
A145245
A145246
*
A145248
A145249
A145250
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Oct 05 2008
STATUS
approved
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Last modified July 23 21:46 EDT 2024. Contains 374575 sequences. (Running on oeis4.)