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A008984 Number of immersions of the oriented circle into the oriented plane with n double points and index 1. 6
1, 1, 3, 10, 35, 133 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

REFERENCES

V. I. Arnold, Topological Invariants of Plane Curves and Caustics, American Math. Soc., 1994, p. 18.

LINKS

Table of n, a(n) for n=0..5.

CROSSREFS

Cf. A008980, A008981, A008982, A008983, A008985, A054993.

Sequence in context: A221130 A084781 A151047 * A151048 A149038 A097148

Adjacent sequences:  A008981 A008982 A008983 * A008985 A008986 A008987

KEYWORD

nonn,nice,more

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified March 29 21:32 EDT 2020. Contains 333117 sequences. (Running on oeis4.)