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 A269101 #13 Aug 13 2020 14:43:20 %S A269101 1,6,7,8,9,12,16,19,22,27 %N A269101 Numbers of circles with the largest possible sum of radii packed inside an ellipse admitting circular solution. %H A269101 Erich Friedman, <a href="https://erich-friedman.github.io/packing/cirRell/">Circles in Ellipses</a> (It is unclear from this page which results are proved and which are just the best known.) %K A269101 nonn,hard,more %O A269101 1,2 %A A269101 _Leonid Broukhis_, Feb 19 2016