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A374086
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Number of integer sequences on a circle of length A373728(n) containing all permutations of the set {1, 2, ..., n} as subsequences.
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0
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OFFSET
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1,2
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COMMENTS
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a(n) is a multiple of n!.
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LINKS
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EXAMPLE
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a(1) = 1 as '1' is the only sequence of length A373728(1) = 1.
a(2) = 2 corresponding to the sequences of length A373728(2) = 2 : {'12', '21'}.
a(3) = 18 corresponding to the sequences of length A062714(3) = 4 : {'1213', '1231', '1232', '1312', '1321', '1323', '2123', '2131', '2132', '2312', '2313', '2321', '3121', '3123', '3132', '3212', '3213', '3231'}.
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CROSSREFS
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KEYWORD
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nonn,hard,more
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AUTHOR
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STATUS
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approved
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