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Search: id:A008983
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| A008983 |
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Number of immersions of the unoriented circle into the unoriented plane with n double points. |
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+0
8
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| 1, 2, 5, 20, 82, 435, 2645, 18489, 141326, 1153052, 9819315
(list; graph; listen)
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OFFSET
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0,2
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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.
S. R. Finch, Knots, links and tangles
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CROSSREFS
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Cf. A008980, A008981, A008982, A008984, A008985, A054993.
Sequence in context: A124264 A027041 A009737 this_sequence A012768 A006228 A002484
Adjacent sequences: A008980 A008981 A008982 this_sequence A008984 A008985 A008986
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KEYWORD
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nonn,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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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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