login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Number of immersions of oriented circle into oriented sphere with n double points and no simple loop.
4

%I #10 Jun 10 2024 15:01:04

%S 0,0,1,1,2,9,29,133,594,2864

%N Number of immersions of oriented circle into oriented sphere with n double points and no simple loop.

%H Robert Coquereaux and Jean-Bernard Zuber, <a href="https://doi.org/10.1142/S0218216516500474">Maps, immersions and permutations</a>, Journal of Knot Theory and Its Ramifications, Vol. 25, No. 8 (2016), 1650047; <a href="https://arxiv.org/abs/1507.03163">arXiv preprint</a>, arXiv:1507.03163 [math.CO], 2015-2016. See Table 6.

%Y Cf. A008986, A264761, A268569, A268570, A268571, A268572.

%K nonn,more

%O 1,5

%A _N. J. A. Sloane_, Mar 03 2016

%E Name clarified by _Andrey Zabolotskiy_, Jun 09 2024