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 A048789 #9 Mar 30 2012 16:48:32 %S A048789 1,4,6,20,66,76,191 %N A048789 "Densities" of the four-dimensional starry polytopes. %C A048789 See reference for precise definition. %C A048789 The old entry with this sequence number was a duplicate of A008284. %D A048789 J. H. Conway et al., The Symmetries of Things, Peters, 2008, p. 406. %K A048789 nonn,fini,full %O A048789 1,2 %A A048789 _N. J. A. Sloane_, Oct 03 2008