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A006651 Number of graphs with n nodes, n+2 edges and no isolated vertices.
(Formerly M3584)
1
1, 4, 22, 110, 515, 2272, 9777, 40752, 166519, 668134, 2644988, 10351321, 40150556, 154591610, 591780559, 2254880616, 8561287942, 32418230925, 122522492807, 462502319244, 1744810912396, 6581954720648, 24839735669771 (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..26.

CROSSREFS

Cf. A048180.

Sequence in context: A220457 A108840 A007994 * A159616 A244423 A144047

Adjacent sequences:  A006648 A006649 A006650 * A006652 A006653 A006654

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Vladeta Jovovic, Mar 02 2008

STATUS

approved

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Last modified January 18 18:56 EST 2018. Contains 297864 sequences.