A006651 Number of graphs with n nodes, n+2 edges and no isolated vertices.

1, 4, 22, 110, 515, 2272, 9777, 40752, 166519, 668134, 2644988, 10351321, 40150556, 154591610, 591780559, 2254880616, 8561287942, 32418230925, 122522492807, 462502319244, 1744810912396, 6581954720648, 24839735669771

Offset: 4

Author

N. J. A. Sloane

Keywords

• nonn

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).

Crossrefs

Cf. A048180.

Extensions

More terms from Vladeta Jovovic, Mar 02 2008