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A084565
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Number of connected switching classes of signed graphs with n nodes.
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1
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1, 1, 3, 12, 79, 1123, 42065, 4880753, 1674021742, 1612191702946, 4291399235883144, 31570649902282023158, 644451747846907273827686, 36675914469877423648734408329, 5846124500387959287169919356171145
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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COMMENTS
| Also, number of unlabeled connected strength 2 Eulerian graphs with n nodes. - Vladeta Jovovic (vladeta(AT)eunet.yu), Mar 14 2009
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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.
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CROSSREFS
| Cf. A007127, A053465.
Sequence in context: A058561 A058107 A023879 * A197445 A207322 A188227
Adjacent sequences: A084562 A084563 A084564 * A084566 A084567 A084568
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jul 16 2003
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com) Apr 05 2009 at the suggestion of Vladeta Jovovic
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