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A018931
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The number of permutations of n cards in which 2 is the first card hit and 3 the next hit after 2.
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1
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0, 1, 2, 12, 72, 480, 3600, 30240, 282240, 2903040, 32659200, 399168000, 5269017600, 74724249600, 1133317785600, 18307441152000, 313841848320000, 5690998849536000, 108840352997376000, 2189611807358976000, 46225138155356160000, 1021818843434188800000
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OFFSET
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3,3
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COMMENTS
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From the game of Mousetrap.
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REFERENCES
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Daniel J. Mundfrom, A problem in permutations: the game of "Mousetrap". European J. Combin. 15 (1994), no. 6, 555-560.
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LINKS
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FORMULA
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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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Offset changed to 3 and more precise definition provided by R. J. Mathar, Oct 02 2008
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STATUS
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approved
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