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Search: id:A052774
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| 1, 1, 9, 169, 4913, 194481, 9765625, 594823321, 42618442977, 3512479453921, 327381934393961, 34050628916015625, 3909821048582988049, 491258904256726154641, 67046038752496061076057
(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 731
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FORMULA
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E.g.f.: exp(-1/4*LambertW(-4*x))
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MAPLE
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spec := [S, {B=Prod(Z, S, S, S, S), S=Set(B)}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A053130 A004107 A017306 this_sequence A122725 A012130 A119032
Adjacent sequences: A052771 A052772 A052773 this_sequence A052775 A052776 A052777
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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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EXTENSIONS
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Better description from Vladeta Jovovic (vladeta(AT)Eunet.yu), Sep 02 2003
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