%I

%S 1,1,3,10,35,133

%N Number of immersions of the oriented circle into the oriented plane with n double points and index 1.

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

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

%K nonn,nice,more

%O 0,3

%A _N. J. A. Sloane_.