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A068288
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1/9 the number of colorings of an n X n staggered hexagonal array with 9 colors.
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1
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1, 392, 5765144, 3181273031384, 65865668592143803208, 51166372312341376389944811656, 1491342882335672198457853495232503998152, 1630939089590623060636571472516037785233254346536136, 66921448813902442793929754551432219305219935812987218443538247160
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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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