A145245 1/5 of the number of 5-colorings of an n X n array symmetric under 180 degree rotation.

1, 4, 172, 7168, 3254620, 1429959400, 6856279647904, 31816048080263248, 1611557504007762068188

Offset

1,2

Links

Table of n, a(n) for n=1..9.

Crossrefs

Sequence in context: A245323 A348085 A195631 * A081783 A222921 A318216

Adjacent sequences: A145242 A145243 A145244 * A145246 A145247 A145248

Keyword

nonn

Author

R. H. Hardin, Oct 05 2008

Status

approved