A084565 Number of connected switching classes of signed graphs with n nodes.

1, 1, 3, 12, 79, 1123, 42065, 4880753, 1674021742, 1612191702946, 4291399235883144, 31570649902282023158, 644451747846907273827686, 36675914469877423648734408329, 5846124500387959287169919356171145

Offset: 1

Author

N. J. A. Sloane, Jul 16 2003

Keywords

• nonn

Comments

Also, number of unlabeled connected strength 2 Eulerian graphs with n nodes. - Vladeta Jovovic, Mar 14 2009

References

• Bussemaker, F. C.; Cameron, P. J.; Seidel, J. J.; and Tsaranov, S. V., Tables of signed graphs, Report-WSK 91-01, Eindhoven University of Technology, Department of Mathematics and Computing Science, Eindhoven, 1991, 105 pp. MR: 92g:05001.

Links

• F. C. Bussemaker, P. J. Cameron, J. J. Seidel, and S. V. Tsaranov, Tables of signed graphs, Report-WSK 91-01, Eindhoven University of Technology, Department of Mathematics and Computing Science, Eindhoven, 1991, 105 pp. (MR: 92g:05001).

Crossrefs

Cf. A007127, A053465.

Extensions

Edited by N. J. A. Sloane Apr 05 2009 at the suggestion of Vladeta Jovovic