A145247 1/6 of the number of 6-colorings of an n X n array symmetric under 180 degree rotation.

1, 5, 445, 38945, 61129245, 94304065705, 2610924486436445, 71050577480317387425

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