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A068274
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1/7 the number of colorings of an n X n rhombic hexagonal array with 7 colors.
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1
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1, 150, 390750, 17684490750, 13905324304629750, 189961153574587570713750, 45086187185888873181881847687750, 185916202268606023083570420269986443660750, 13319440571031747382017558973436842742801064314274750
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OFFSET
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1,2
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COMMENTS
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Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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