A068287 1/8 the number of colorings of an n X n staggered hexagonal array with 8 colors.

1, 252, 1679832, 296251234272, 1382247232944627672, 170624931716603851850980512, 557224793178655263880694805929352312, 48144818121088035723665058177874441292104576992, 110052483236400191824645806778218519319800722550874233268152

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