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

%I #8 May 04 2012 15:03:29

%S 1,336,3120768,803828696832,5741675134355623680,

%T 1137328489147110235271041536,6247483084664157761011047760647844608,

%U 951691164013203510495082805169876313498509196032

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 24 2002

%E a(6)-a(8) from _Alois P. Heinz_, May 04 2012