A068302 1/13 the number of colorings of an n X n octagonal array with 13 colors.

1, 1320, 146520000, 1368698694000000, 1075984617953259154800000, 71185491858527630409715040263200000, 396336553255260873925931533264339353950473200000, 185705162149755607151153966767311643039842133737264420356400000

Offset: 1

Author

R. H. Hardin, Feb 24 2002

Keywords

• nonn

Crossrefs

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

Extensions

a(5)-a(8) from Alois P. Heinz, May 04 2012