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 A028109 #2 May 11 2007 03:00:00 %S A028109 1,22,305,3410,33621,305382,2619625,21554170,171870941 %N A028109 Duplicate of A003468. %K A028109 dead %O A028109 0,2