A068298 1/9 the number of colorings of an n X n octagonal array with 9 colors.

1, 336, 3120768, 803828696832, 5741675134355623680, 1137328489147110235271041536, 6247483084664157761011047760647844608, 951691164013203510495082805169876313498509196032

Offset: 1

Author

R. H. Hardin, Feb 24 2002

Keywords

• nonn

Crossrefs

Cf. A068239-A068305, A000332, A002417, A027441, A212208, A212209.

Extensions

a(6)-a(8) from Alois P. Heinz, May 04 2012