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A006649 Number of graphs with n nodes, n edges and no isolated vertices.
(Formerly M1474)
+0
1
1, 2, 5, 15, 41, 124, 369, 1132, 3491, 10984, 34768, 111514, 360560, 1176797, 3870389, 12829765, 42829894, 143980892, 487227611, 1659499566, 5688046485, 19617965938, 68078878268, 237694501644 (list; graph; listen)
OFFSET

3,2

REFERENCES

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.

CROSSREFS

Cf. A001434, A048179.

Sequence in context: A148348 A148349 A076865 this_sequence A148350 A094176 A084086

Adjacent sequences: A006646 A006647 A006648 this_sequence A006650 A006651 A006652

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

EXTENSIONS

More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Mar 02 2008

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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