A145253 1/8 of the number of 8-colorings of an n X n array symmetric under 180 degree rotation.

1, 7, 1855, 488509, 4884669475, 48533789554789, 18312348548135120059

Offset

1,2

Links

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

Crossrefs

Sequence in context: A172937 A185407 A332303 * A248730 A024099 A056235

Adjacent sequences: A145250 A145251 A145252 * A145254 A145255 A145256

Keyword

nonn

Author

R. H. Hardin, Oct 05 2008

Status

approved