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 A268563 #16 Jun 09 2024 09:04:27 %S A268563 1,1,5,33,249,2036,17572,157676,1457037 %N A268563 Number of immersions of unoriented circle into oriented sphere with 2n double points such that two different choices of orientation of the circle are related by geotopy. %H A268563 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 Eq. (16), r_s. %F A268563 a(n) = 2 * A008987(2*n) - A008986(2*n). - _Andrey Zabolotskiy_, Jun 05 2024 %Y A268563 Cf. A008986, A008987, A268564, A373325. %K A268563 nonn,more %O A268563 0,3 %A A268563 _N. J. A. Sloane_, Mar 02 2016 %E A268563 Name clarified and a(0), a(6)-a(8) added using formula by _Andrey Zabolotskiy_, Jun 07 2024