A145259 1/9 of the number of 9-colorings of an n X n array symmetric about both diagonal and antidiagonal.

1, 8, 512, 29184, 13307904, 5404672512, 17559792635904, 50811763602977280, 1176249454737889112064, 24250990871047073899451904, 3999906334177619217671691141120

Offset

1,2

Links

Table of n, a(n) for n=1..11.

Crossrefs

Sequence in context: A236220 A128794 A195804 * A154025 A013713 A109966

Adjacent sequences: A145256 A145257 A145258 * A145260 A145261 A145262

Keyword

nonn

Author

R. H. Hardin, Oct 05 2008

Status

approved