A268562 Number of bicolored immersions of oriented circle into oriented surface with n double points, up to stable geotopy.

2, 6, 20, 108, 776, 7772, 92172, 1291048, 20644140

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Robert Coquereaux and Jean-Bernard Zuber, Maps, immersions and permutations, Journal of Knot Theory and Its Ramifications, Vol. 25, No. 8 (2016), 1650047; arXiv preprint, arXiv:1507.03163 [math.CO], 2015-2016. See Table 9, line OOc total.

Crossrefs

Cf. A268559.

Sequence in context: A078566 A076323 A241782 * A287009 A243252 A366760

Adjacent sequences: A268559 A268560 A268561 * A268563 A268564 A268565

Keyword

nonn,more

Author

N. J. A. Sloane, Mar 02 2016

Extensions

Name clarified by Andrey Zabolotskiy, Jun 09 2024

Status

approved