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Search: id:A006289
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| A006289 |
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Number of series-reduced 2-connected graphs with n nodes.
(Formerly M3058)
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+0
3
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| 1, 3, 19, 149, 2581, 84151, 5201856, 577050233, 113372069299, 39618015318982, 24916462761069296, 28563626972509456884, 60366734349116636660402, 237406975840304068884168139, 1750330441810569047176394509086
(list; graph; listen)
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OFFSET
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4,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
R. W. Robinson and T. R. S. Walsh, Inversion of cycle index sum relations for 2- and 3-connected graphs. J. Combin. Theory Ser. B 57 (1993), no. 2, 289-308.
Walsh, T. R. S.; Counting unlabeled three-connected and homeomorphically irreducible two-connected graphs. J. Combin. Theory Ser. B 32 (1982), no. 1, 12-32.
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LINKS
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R. W. Robinson, Tables
R. W. Robinson and T. R. S. Walsh, Inversion of cycle index sum relations for 2- and 3-connected graphs, J. Combin. Theory Ser. B. 57 (1993), 289-308.
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CROSSREFS
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Cf. A006290.
Sequence in context: A131551 A074546 A054316 this_sequence A120590 A007112 A007111
Adjacent sequences: A006286 A006287 A006288 this_sequence A006290 A006291 A006292
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KEYWORD
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nonn,easy,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
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Robinson and Walsh list first 25 terms.
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