A145250 1/7 of the number of 7-colorings of an n X n array symmetric under 180 degree rotation.

1, 6, 966, 153996, 661773786, 2815356109536, 322956657504465996, 36676462296254099505756

Offset

1,2

Links

Table of n, a(n) for n=1..8.

Crossrefs

Sequence in context: A263423 A266598 A250392 * A332196 A375020 A024085

Adjacent sequences: A145247 A145248 A145249 * A145251 A145252 A145253

Keyword

nonn

Author

R. H. Hardin, Oct 05 2008

Status

approved