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A111564
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Number of outerplanar graphs on n unlabeled nodes.
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2
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1, 2, 4, 10, 25, 80, 277, 1150, 5291, 26918, 145744, 828856, 4872771, 29395784, 180857382, 1130700488, 7163245811, 45895629266, 296937363511, 1937625709854, 12739784808937, 84331837321404, 561647630439975, 3761221057579892
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..24.
M. Bordirsky, É. Fusy, M. Kang and S. Vigerske, Enumeration of Unlabeled Outerplanar Graphs, 2005
S. Vigerske, Asymptotic enumeration of unlabeled outerplanar graphs, Diploma thesis, Humboldt University Berlin, 2005
S. Vigerske, Homepage
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FORMULA
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Generating function and cycle index sum known, see Vigerske, or Bodirsky, Fusy, Kang and Vigerske.
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CROSSREFS
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Cf. A001004, A097999, A097998, A098000.
Sequence in context: A123422 A123413 A085633 * A350507 A007021 A100605
Adjacent sequences: A111561 A111562 A111563 * A111565 A111566 A111567
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KEYWORD
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nonn
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AUTHOR
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Stefan Vigerske, Nov 17 2005
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STATUS
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approved
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