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 A049338 #1 Dec 11 1999 03:00:00 %S A049338 1,1,1,2,5,14,50,233,1249,7616 %N A049338 Erroneous version of A000109. %K A049338 dead %O A049338 3,4