A145251 1/8 of the number of 8-colorings of an n X n array symmetric about main diagonal.

1, 49, 14749, 27270901, 309747333007, 21611597821416253, 9262695628779625138057, 24387041941030585188110420941, 394413773105599656230374829245322143

Offset

1,2

Links

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

Crossrefs

Sequence in context: A194023 A195273 A222459 * A381163 A202991 A203061

Adjacent sequences: A145248 A145249 A145250 * A145252 A145253 A145254

Keyword

nonn

Author

R. H. Hardin, Oct 05 2008

Status

approved