A068263 1/13 the number of colorings of an n X n square array with 13 colors.

1, 1596, 312900732, 7535656472652144, 22293406028991258906822012, 8101633271611742223009066926458678872, 361667559847367304628616562064628954963501797097616, 1983295161343761814393139138003147798350023823439773839309854050176

Offset: 1

Author

R. H. Hardin, Feb 24 2002

Keywords

• nonn

Crossrefs

Cf. A068239-A068305, A000332, A002417, A027441, A182368, A182406.

Extensions

a(5)-a(8) from Alois P. Heinz, Apr 27 2012