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A068273
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1/6 the number of colorings of an n X n rhombic hexagonal array with 6 colors.
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1
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1, 80, 65600, 552093440, 47694893373440, 42294602754348892160, 384991688574716612134952960, 35972520655083241381477879725916160, 34501934082562716587411029908821592862883840, 339679276508747763623945195020701159657032777565470720
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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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