Search: id:A047865
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%I A047865
%S A047865 1,0,0,0,6,24,120,720,6300,58464,586656,6384960,76471560,994831200,
%T A047865 13939507296,209097854784,3345235180560,56866395720960,1023601917024000,
%U A047865 19448577603454464,388972171805410656,8168409582839579520
%N A047865 Number of derangements of n where minimal cycle size is 4.
%D A047865 H. S. Wilf, Generatingfunctionology, Academic Press, NY, 1990, p. 147, 
               Eq. 5.2.9 (q=3).
%H A047865 H. S. Wilf, <a href="http://www.math.upenn.edu/~wilf/DownldGF.html">Generatingfunctionology</
               a>, 2nd edn., Academic Press, NY, 1994, p. 176, Eq. 5.2.9 (q=3).
%p A047865 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
%Y A047865 Cf. A038205, A000166.
%Y A047865 Sequence in context: A026982 A051197 A050212 this_sequence A060249 A052557 
               A052170
%Y A047865 Adjacent sequences: A047862 A047863 A047864 this_sequence A047866 A047867 
               A047868
%K A047865 nonn
%O A047865 0,5
%A A047865 N. J. A. Sloane (njas(AT)research.att.com).

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