A268566 Number of chiral immersions of oriented circle into oriented sphere with 2n double points.
0, 1, 16, 564, 27231, 1625324, 110854838, 8306977585, 667683610221
Offset: 0
Links
- 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 Eq. (17), s_m.
Formula
Extensions
Name clarified and a(0), a(6)-a(8) added using formula by Andrey Zabolotskiy, Jun 08 2024