A068289 1/10 the number of colorings of an n X n staggered hexagonal array with 10 colors.

1, 576, 16777728, 24714188421120, 1841036276621803037184, 6935553434442856919411660285952, 1321303788659476737000614691012213371920896, 12729959462391097361772684882480600791246770039196989440, 6202319628516337592369784708824005819049596658116953675819712797024768

Offset: 1

Author

R. H. Hardin, Feb 24 2002

Keywords

• nonn

Comments

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

Crossrefs

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

Extensions

a(6)-a(9) from Alois P. Heinz, May 03 2012