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 A090555 #2 Jan 24 2006 03:00:00 %S A090555 10,1,2,4,8,16 %N A090555 Erroneous version of A014573. %K A090555 dead %O A090555 1,1