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A145253 1/8 of the number of 8-colorings of an n X n array symmetric under 180 degree rotation. 0
1, 7, 1855, 488509, 4884669475, 48533789554789, 18312348548135120059 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Sequence in context: A206459 A172937 A185407 * A248730 A024099 A056235

Adjacent sequences:  A145250 A145251 A145252 * A145254 A145255 A145256

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 05 2008

STATUS

approved

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Last modified October 24 00:04 EDT 2018. Contains 316541 sequences. (Running on oeis4.)