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A145260 1/9 of the number of 9-colorings of an n X n array symmetric under 180 degree rotation. 0
1, 8, 3256, 1319648, 27265229496, 560946752022448 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..6.

CROSSREFS

Sequence in context: A217270 A137565 A281323 * A201100 A079177 A298279

Adjacent sequences: A145257 A145258 A145259 * A145261 A145262 A145263

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 05 2008

STATUS

approved

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Last modified January 31 22:24 EST 2023. Contains 359981 sequences. (Running on oeis4.)