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 A193556 #7 Jan 29 2016 11:12:58 %S A193556 4,4,2,1,578,16,98,4418,98,2,36,841,3042,4,1058 %N A193556 Denominators of the squared radii of the smallest enclosing circles of n points with integer coordinates and distinct mutual distances, arranged such that the radius of their enclosing circle is minimized. Numerators are given in A193555. %C A193556 See A193555. %Y A193556 Cf. A193555 corresponding numerators. %K A193556 nonn,frac,hard %O A193556 2,1 %A A193556 _Hugo Pfoertner_, Jul 30 2011