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A007146
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Number of bridgeless graphs with n nodes.
(Formerly M2909)
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2
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1, 0, 1, 3, 11, 60, 502, 7403, 197442, 9804368, 902818087, 153721215608, 48443044675155, 28363687700395422, 30996524108446916915, 63502033750022111383196, 244852545022627009655180986
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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REFERENCES
| P. Hanlon and R. W. Robinson, Counting bridgeless graphs, J. Combin. Theory, B 33 (1982), 276-305.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 06 2007, Table of n, a(n) for n = 1..22
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CROSSREFS
| Cf. A007145.
Sequence in context: A007807 A075201 A136440 * A076475 A125556 A127516
Adjacent sequences: A007143 A007144 A007145 * A007147 A007148 A007149
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KEYWORD
| nonn,nice,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Reference gives first 22 terms.
More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 06 2007
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