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 A099747 #2 Sep 29 2006 03:00:00 %S A099747 0,1,2,4,5,6,8,10,40,46,60,61,64,80,84,5000 %N A099747 Duplicate of A059916. %K A099747 dead %O A099747 1,3