A068284 1/5 the number of colorings of an n X n staggered hexagonal array with 5 colors.

1, 36, 6588, 6169500, 29609340804, 728465439240612, 91873868538291559236, 59398217444060775978706980, 196856852524443536659406407297548

Offset

1,2

Comments

Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.

Links

Table of n, a(n) for n=1..9.

Crossrefs

Cf. A068239-A068305, A000332, A002417, A027441, A212194, A212195.

Sequence in context: A381199 A326999 A068272 * A145248 A222974 A013739

Adjacent sequences: A068281 A068282 A068283 * A068285 A068286 A068287

Keyword

nonn

Author

R. H. Hardin, Feb 24 2002

Extensions

a(8)-a(9) from Alois P. Heinz, May 03 2012

Status

approved