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 A080091 #4 May 11 2007 03:00:00 %S A080091 1,1,1,1,2,3,5,9,18,35,75,159,355,802,1858,4347,10359,24894,60523 %N A080091 Duplicate of A000602. %K A080091 dead %O A080091 0,5