A068269 1/19 the number of colorings of an n X n square array with 19 colors.

1, 5526, 8882874018, 4153630571837864748, 564981170863476314096512687566, 22354853275061169487985050625489956484533056, 257300965334378745090532920060644632998190650709754736514068, 861475141050998806961235302195978945049151803599433480523424276423626596675468

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