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Search: id:A006648
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| A006648 |
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Number of graphs with n nodes, n-1 edges and no isolated vertices.
(Formerly M1181)
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+0
1
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| 1, 1, 2, 4, 9, 20, 50, 124, 332, 895, 2513, 7172, 20994, 62366, 188696, 578717, 1799999, 5666257, 18047319, 58097540, 188953756, 620493315, 2056582095, 6877206111, 23195975865
(list; graph; listen)
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OFFSET
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2,3
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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).
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.
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CROSSREFS
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Cf. A001433, A001434.
Sequence in context: A093637 A068051 A032289 this_sequence A128496 A134955 A027881
Adjacent sequences: A006645 A006646 A006647 this_sequence A006649 A006650 A006651
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KEYWORD
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nonn
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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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More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 02 2008
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