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 A015887 #5 Sep 21 2005 03:00:00 %S A015887 1,3,4,3,8,5,24,5,13,9,20,7,48,13,16,13,26,17,52,19,37,21,44,13,96 %N A015887 Erroneous version of A007015. %K A015887 dead %O A015887 0,2