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 A084889 #4 May 11 2007 03:00:00 %S A084889 2,5,8,10,13,17,18,20,25,26,29,32,34,37,40,41,45,50,52,53,58,61,65,68 %N A084889 Duplicate of A000404. %K A084889 dead %O A084889 1,1