A268559 - OEIS

%I #9 Jun 10 2024 15:00:46

%S 2,3,14,54,420,3886,46470,645524,10328214

%N Number of bicolored immersions of unoriented circle into oriented surface with n double points, up to stable geotopy.

%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 9, line UOc total.

%Y Cf. A268561, A268562.

%K nonn,more

%O 1,1

%A _N. J. A. Sloane_, Mar 02 2016

%E Name clarified by _Andrey Zabolotskiy_, Jun 09 2024