A145252 1/8 of the number of 8-colorings of an n X n array symmetric about both diagonal and antidiagonal.

1, 7, 343, 14749, 4439449, 1172648743, 2168231331049, 3518160769178167, 39959916168271359799, 398295912044286028090213, 27789833914848401703684111343

Offset

1,2

Links

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

Crossrefs

Sequence in context: A068150 A195803 A263220 * A154024 A013712 A109493

Adjacent sequences: A145249 A145250 A145251 * A145253 A145254 A145255

Keyword

nonn

Author

R. H. Hardin, Oct 05 2008

Status

approved