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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Sequence in context: A218393 A038003 A054332 * A212042 A177026 A055305

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 February 24 06:13 EST 2018. Contains 299597 sequences. (Running on oeis4.)