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A115507
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Number of circular permutations of {1, 2, ..., n}, where every next element in binary notation has ones at the same or adjacent positions of previous element's binary ones.
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3
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1, 1, 2, 1, 2, 18, 72, 42, 126, 1080, 5400, 42240, 253440, 3578400, 28627200, 16914240, 54396720, 620978400, 5417102880, 40328285760, 322626286080, 5081458717440, 50814587174400, 426996628531200, 5623077380659200, 115361923377254400
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OFFSET
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1,3
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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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