A068304 1/15 the number of colorings of an n X n octagonal array with 15 colors.

1, 2184, 592510464, 19977134899857408, 83707407272669822670292992, 43590120924896822733942257303419219968, 2821017309275220614373517914989957826683223925291008, 22689081840779777447950160850969786755578939429093239677401474639872

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