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Search: id:A008985
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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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+0
7
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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; listen)
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OFFSET
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0,6
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REFERENCES
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V. I. Arnold, Topological Invariants of Plane Curves..., American Math. Soc., 1994, p. 18.
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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. A008980, A008981, A008982, A008983, A008984, A054993.
Sequence in context: A131469 A073078 A034799 this_sequence A138652 A131899 A095174
Adjacent sequences: A008982 A008983 A008984 this_sequence A008986 A008987 A008988
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KEYWORD
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nonn,nice,tabl
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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