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Search: id:A052512
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| A052512 |
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Number of labeled trees of height 2. |
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+0
5
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| 0, 1, 2, 9, 40, 205, 1176, 7399, 50576, 372537, 2936080, 24617131, 218521128, 2045278261, 20112821288, 207162957135, 2228888801056, 24989309310961, 291322555295904, 3524580202643155, 44176839081266360
(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 58
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FORMULA
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E.g.f.: x*exp(x*exp(x))
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MAPLE
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spec := [S, {S=Prod(Z, Set(T1)), T2=Z, T1=Prod(Z, Set(T2))}, labeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
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Sequence in context: A107979 A021001 A038112 this_sequence A038156 A052846 A056844
Adjacent sequences: A052509 A052510 A052511 this_sequence A052513 A052514 A052515
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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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