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A268569
Number of immersions of unoriented circle into oriented sphere with n double points and no simple loop.
4
0, 0, 1, 1, 2, 6, 19, 74, 320, 1469
OFFSET
1,5
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 Table 6.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Mar 03 2016
EXTENSIONS
Name clarified by Andrey Zabolotskiy, Jun 09 2024
STATUS
approved