OFFSET
0,3
COMMENTS
a(10) = 1625916 by sampling method (to be confirmed, cf. ref. arXiv:1507.03163). - Robert Coquereaux, Nov 23 2015
a(10) = 1625916 confirmed. - Brendan McKay, Mar 29 2024
REFERENCES
V. I. Arnold, Topological Invariants of Plane Curves and Caustics, American Math. Soc., 1994, p. 18.
Guy Valette, A Classification of Spherical Curves Based on Gauss Diagrams, Arnold Math J. (2016) 2:383-405, DOI 10.1007/s40598-016-0049-3.
LINKS
R. Coquereaux and J.-B. Zuber, Maps, immersions and permutations, arXiv preprint arXiv:1507.03163 [math.CO], 2015-2016. Also DOI, J. Knot Theory Ramifications 25, 1650047 (2016).
PROG
(Magma) // see A260885
CROSSREFS
KEYWORD
nonn,nice,more
AUTHOR
EXTENSIONS
a(6)-a(7) from Guy Valette, Feb 09 2004
a(8)-a(9) from Robert Coquereaux and Jean-Bernard Zuber, Jul 21 2015
a(10) from same source added by N. J. A. Sloane, Mar 03 2016
a(11)-a(16) from Brendan McKay, Mar 29 2024
STATUS
approved