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Search: id:A052865
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| 0, 0, 2, 18, 166, 1720, 20168, 265776, 3900048, 63160944, 1119902112, 21588456912, 449695165104, 10068121989120, 241142216363904, 6153066311872128, 166649425520796288, 4775084999073669888
(list; graph; listen)
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OFFSET
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0,3
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LINKS
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INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 833
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FORMULA
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E.g.f.: ln(-1/(-1+x))^2/(-1+ln(-1/(-1+x)))^2
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MAPLE
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spec := [S, {C=Cycle(Z), B=Sequence(C, 1 <= card), S=Prod(B, B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Adjacent sequences: A052862 A052863 A052864 this_sequence A052866 A052867 A052868
Sequence in context: A005260 A037728 A037623 this_sequence A052883 A052665 A092473
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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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