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A006650
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Number of graphs with n nodes, n+1 edges and no isolated vertices.
(Formerly M3903)
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0
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1, 5, 20, 73, 271, 974, 3507, 12487, 44475, 157814, 559952, 1985053, 7040855, 24986930, 88782435, 315911844, 1126178655, 4023135764, 14406870196, 51728509807, 186275015554, 672886200335
(list; graph; refs; listen; history; internal format)
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OFFSET
| 4,2
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REFERENCES
| W. L. Kocay, Some new methods in reconstruction theory, pp. 89 - 114 of Combinatorial Mathematics IX. Proc. Ninth Australian Conference (Brisbane, August 1981). Ed. E. J. Billington, S. Oates-Williams and A. P. Street. Lecture Notes Math., 952. Springer-Verlag, 1982.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Cf. A048179, A048180.
Sequence in context: A137212 A118049 A114247 * A034535 A094806 A026639
Adjacent sequences: A006647 A006648 A006649 * A006651 A006652 A006653
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 02 2008
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