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Search: id:A008980
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| A008980 |
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Number of immersions of the oriented circle into the oriented plane with n double points. |
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+0
7
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| 2, 3, 10, 39, 204, 1262, 8984, 67959, 544504, 4535030, 39004772
(list; graph; listen)
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OFFSET
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0,1
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REFERENCES
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V. I. Arnold, Topological Invariants of Plane Curves..., American Math. Soc., 1994, p. 16.
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LINKS
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S. M. Gusein-Zade and F. S. Duzhin, On the number of topological types of plane curves; (Russian) Uspekhi Mat. Nauk 53 (1998), no. 3(321), 197-198. English translation: Russian Mathematical Surveys 53 (1998) 626-627.
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CROSSREFS
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Cf. A008981, A008982, A008983, A008984, A008985, A054993.
Adjacent sequences: A008977 A008978 A008979 this_sequence A008981 A008982 A008983
Sequence in context: A060604 A141102 A003048 this_sequence A064183 A050381 A129716
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KEYWORD
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nonn,nice
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AUTHOR
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njas
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EXTENSIONS
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Additional comments from Sergei V. Duzhin (duzhin(AT)botik.ru), Nov 11, 2000.
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