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A006650 Number of graphs with n nodes, n+1 edges and no isolated vertices.
(Formerly M3903)
1
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; text; internal format)
OFFSET

4,2

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).

LINKS

Table of n, a(n) for n=4..25.

CROSSREFS

Cf. A048179, A048180.

Sequence in context: A118049 A114247 A272086 * A034535 A316222 A273718

Adjacent sequences:  A006647 A006648 A006649 * A006651 A006652 A006653

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vladeta Jovovic, Mar 02 2008

STATUS

approved

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Last modified May 7 15:45 EDT 2021. Contains 343651 sequences. (Running on oeis4.)