A006650 Number of graphs with n nodes, n+1 edges and no isolated vertices.

1, 5, 20, 73, 271, 974, 3507, 12487, 44475, 157814, 559952, 1985053, 7040855, 24986930, 88782435, 315911844, 1126178655, 4023135764, 14406870196, 51728509807, 186275015554, 672886200335

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. A048179, A048180.

Extensions

More terms from Vladeta Jovovic, Mar 02 2008