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A068286
1/7 the number of colorings of an n X n staggered hexagonal array with 7 colors.
1
1, 150, 390750, 17684490750, 13905331460469750, 189961376944305892137750, 45086270412704540409445089549750, 185916670055945278226619825124072763091750, 13319483009963134380534870853035913218901916338644750
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(7)-a(9) from Alois P. Heinz, May 03 2012
STATUS
approved