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1/15 the number of colorings of an n X n octagonal array with 15 colors.
1

%I #8 May 04 2012 18:18:38

%S 1,2184,592510464,19977134899857408,83707407272669822670292992,

%T 43590120924896822733942257303419219968,

%U 2821017309275220614373517914989957826683223925291008,22689081840779777447950160850969786755578939429093239677401474639872

%N 1/15 the number of colorings of an n X n octagonal array with 15 colors.

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 24 2002

%E a(5)-a(8) from _Alois P. Heinz_, May 04 2012