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A008985
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Triangle T(n,k) giving number of immersions of the oriented circle into the oriented plane with n double points and index k.
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6
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1, 1, 1, 1, 1, 2, 3, 3, 2, 4, 10, 11, 10, 4, 10, 35, 57, 57, 35, 10, 26, 133, 290, 364, 290, 133, 26
(list; table; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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REFERENCES
| V. I. Arnold, Topological Invariants of Plane Curves..., American Math. Soc., 1994, p. 18.
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LINKS
| 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
| Cf. A008980, A008981, A008982, A008983, A008984, A054993.
Sequence in context: A131469 A073078 A034799 * A138652 A131899 A095174
Adjacent sequences: A008982 A008983 A008984 * A008986 A008987 A008988
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KEYWORD
| nonn,nice,tabl
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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