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 A260995 #3 Aug 09 2015 09:03:30 %S A260995 1,1,3,14,168 %N A260995 Erroneous version of A250001. %C A260995 Included in accordance with OEIS policy of including published but erroneous sequences, to serve as pointers to the correct versions. %K A260995 dead %O A260995 1,3