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Search: id:A047865
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| A047865 |
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Number of derangements of n where minimal cycle size is 4. |
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+0
4
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| 1, 0, 0, 0, 6, 24, 120, 720, 6300, 58464, 586656, 6384960, 76471560, 994831200, 13939507296, 209097854784, 3345235180560, 56866395720960, 1023601917024000, 19448577603454464, 388972171805410656, 8168409582839579520
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OFFSET
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0,5
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REFERENCES
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H. S. Wilf, Generatingfunctionology, Academic Press, NY, 1990, p. 147, Eq. 5.2.9 (q=3).
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LINKS
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H. S. Wilf, Generatingfunctionology, 2nd edn., Academic Press, NY, 1994, p. 176, Eq. 5.2.9 (q=3).
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MAPLE
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ZL3:=[S, {S=Set(Cycle(Z, card>3))}, labeled] :seq(count(ZL3, size=n), n=0..21); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Sep 26 2007
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CROSSREFS
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Cf. A038205, A000166.
Sequence in context: A026982 A051197 A050212 this_sequence A060249 A052557 A052170
Adjacent sequences: A047862 A047863 A047864 this_sequence A047866 A047867 A047868
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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