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 A276110 #18 May 30 2018 10:51:17 %S A276110 1,2,5,102,11556,5370725,7198391729 %N A276110 The number of rotation systems of drawings of the complete graph K_n, where the rotation system describes the clockwise cyclic order of incident edges around each vertex. %C A276110 The number of realizable order types on n points in the plane (A063666) is exactly the number of rotation systems of straight-line drawings of K_n. %H A276110 B. M. Ábrego, O. Aichholzer, S. Fernández-Merchant, T. Hackl, J. Pammer, A. Pilz, P. Ramos, G. Salazar, and B. Vogtenhuber, <a href="http://www.ist.tugraz.at/cpgg/downloadables/aafhpprsv-agdsc-15.pdf">All Good Drawings of Small Complete Graphs</a>, In Proc. 31st European Workshop on Computational Geometry EuroCG '15, pages 57-60, Ljubljana, Slovenia, 2015. %H A276110 A. Arroyo, D. McQuillan, and B. Richter, <a href="http://www.ifisica.uaslp.mx/~gsalazar/RESEARCH/gioan.pdf">Drawings of Kn with the same rotation scheme are the same up to Reidemeister moves (Gioan's Theorem)</a>, submitted, 2015. %H A276110 J. Kynčl, <a href="http://dx.doi.org/10.1016/j.ejc.2009.03.005">Enumeration of simple complete topological graphs, European Journal of Combinatorics</a>, 30(7):1676-1685, 2009. %H A276110 Wikipedia, <a href="http://en.wikipedia.org/wiki/Rotation_system">Rotation Systems</a> %Y A276110 Coincides with A276109 for n <= 5. %Y A276110 Cf. A000241, A063666. %K A276110 nonn,more %O A276110 3,2 %A A276110 _Manfred Scheucher_, Aug 18 2016