This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A008986 #57 Mar 30 2024 11:39:29 %S A008986 1,1,3,9,37,182,1143,7553,54559,412306,3251240,26478264,221714164, %T A008986 1900103364,16613990484,147816411921,1335367515821 %N A008986 Number of immersions of oriented circle into oriented sphere with n double points. %C A008986 a(10) = 3251240 by sampling method (to be confirmed, cf. ref. arXiv:1507.03163). - _Robert Coquereaux_, Nov 23 2015 %C A008986 a(10) = 3251240 confirmed. - _Brendan McKay_, Mar 29 2024 %D A008986 V. I. Arnold, Topological Invariants of Plane Curves and Caustics, American Math. Soc., 1994, p. 18. %H A008986 R. Coquereaux and J.-B. Zuber, <a href="http://arxiv.org/abs/1507.03163">Maps, immersions and permutations</a>, arXiv preprint arXiv:1507.03163 [math.CO], 2015-2016. Also J. Knot Theory Ramifications 25, 1650047 (2016), DOI: http://dx.doi.org/10.1142/S0218216516500474 %H A008986 Guy Valette, <a href="https://doi.org/10.1007/s40598-016-0049-3">A Classification of Spherical Curves Based on Gauss Diagrams</a>, Arnold Math J. (2016) 2:383-405. %o A008986 (Magma) /* For Magma program see A260285. */ %Y A008986 Cf. A008987, A008988, A008989. First line of triangle A260285. %K A008986 nonn,more %O A008986 0,3 %A A008986 _N. J. A. Sloane_ %E A008986 a(6)-a(7) from _Guy Valette_, Feb 09 2004 %E A008986 a(8)-a(9) from _Robert Coquereaux_ and Jean-Bernard Zuber, Jul 21 2015 %E A008986 a(10) from same source added by _N. J. A. Sloane_, Mar 03 2016 %E A008986 a(11)-a(16) from _Brendan McKay_, Mar 29 2024