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 A090554 #2 Jan 24 2006 03:00:00 %S A090554 1,12,42,96,72 %N A090554 Erroneous version of A007368. %K A090554 dead %O A090554 1,2