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 A006986 #4 Dec 11 1999 03:00:00 %S A006986 1,1,2,7,23,114,625,3974 %N A006986 Erroneous version of A038119. %K A006986 dead %O A006986 1,3