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 A268570 #10 Jun 10 2024 15:00:50 %S A268570 0,0,1,1,2,5,18,70,313,1440 %N A268570 Number of immersions of oriented circle into unoriented sphere with n double points and no simple loop. %H A268570 Robert Coquereaux and Jean-Bernard Zuber, <a href="https://doi.org/10.1142/S0218216516500474">Maps, immersions and permutations</a>, Journal of Knot Theory and Its Ramifications, Vol. 25, No. 8 (2016), 1650047; <a href="https://arxiv.org/abs/1507.03163">arXiv preprint</a>, arXiv:1507.03163 [math.CO], 2015-2016. See Table 6. %Y A268570 Cf. A008988, A007756, A268568, A268569, A268571, A268572. %K A268570 nonn,more %O A268570 1,5 %A A268570 _N. J. A. Sloane_, Mar 03 2016 %E A268570 Name clarified by _Andrey Zabolotskiy_, Jun 09 2024