A068302 - OEIS

%I #8 May 04 2012 16:17:03

%S 1,1320,146520000,1368698694000000,1075984617953259154800000,

%T 71185491858527630409715040263200000,

%U 396336553255260873925931533264339353950473200000,185705162149755607151153966767311643039842133737264420356400000

%N 1/13 the number of colorings of an n X n octagonal array with 13 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