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Search: id:A052514
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| A052514 |
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Number of labeled trees of height 4. |
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+0
4
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| 0, 1, 2, 9, 64, 625, 7056, 89929, 1284032, 20351601, 354648160, 6736612201, 138472331328, 3061103815081, 72391319923664, 1823032999274985, 48692068509655936, 1374488205290880481, 40877130077266074048
(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 60
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FORMULA
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E.g.f.: x*exp(x*exp(x*exp(x*exp(x))))
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MAPLE
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spec := [S, {T2=Prod(Z, Set(T3)), S=Prod(Z, Set(T1)), T4=Z, T3=Prod(Z, Set(T4)), 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: A036775 A141209 A128577 this_sequence A036776 A036777 A000169
Adjacent sequences: A052511 A052512 A052513 this_sequence A052515 A052516 A052517
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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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