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A008984
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Number of immersions of the oriented circle into the oriented plane with n double points and index 1.
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6
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OFFSET
| 0,3
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REFERENCES
| V. I. Arnold, Topological Invariants of Plane Curves..., American Math. Soc., 1994, p. 18.
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CROSSREFS
| Cf. A008980, A008981, A008982, A008983, A008985, A054993.
Sequence in context: A151046 A084781 A151047 * A151048 A149038 A097148
Adjacent sequences: A008981 A008982 A008983 * A008985 A008986 A008987
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KEYWORD
| nonn,nice
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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