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Search: id:A052759
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| 0, 0, 0, 0, 24, 60, 240, 1260, 8064, 60480, 518400, 4989600, 53222400, 622702080, 7925299200, 108972864000, 1609445376000, 25406244864000, 426824913715200, 7602818775552000, 143111882833920000
(list; graph; listen)
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OFFSET
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0,5
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LINKS
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INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 716
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FORMULA
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E.g.f.: x^3*ln(-1/(-1+x))
Recurrence: {a(1)=0, a(2)=0, a(3)=0, a(4)=24, (-n^2+2*n+3)*a(n)+(-2+n)*a(n+1)}
0
a(n) = n! / (n-3) (n > 3) - Olivier Gerard (olivier.gerard(AT)gmail.com), Jun 13 2001
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MAPLE
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spec := [S, {B=Cycle(Z), S=Prod(B, Z, Z, Z)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A044507 A101860 A163636 this_sequence A045558 A022761 A090386
Adjacent sequences: A052756 A052757 A052758 this_sequence A052760 A052761 A052762
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KEYWORD
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easy,nonn
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AUTHOR
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encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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