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 A086969 #3 May 11 2007 03:00:00 %S A086969 2,2,3,4,7,8,11,12,15,20,21,26,29,30,33,38,43,44,49,52,53,58,61,66,73 %N A086969 Duplicate of A014692. %K A086969 dead %O A086969 1,1