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A068287
1/8 the number of colorings of an n X n staggered hexagonal array with 8 colors.
1
1, 252, 1679832, 296251234272, 1382247232944627672, 170624931716603851850980512, 557224793178655263880694805929352312, 48144818121088035723665058177874441292104576992, 110052483236400191824645806778218519319800722550874233268152
OFFSET
1,2
COMMENTS
Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 24 2002
EXTENSIONS
a(6)-a(9) from Alois P. Heinz, May 03 2012
STATUS
approved