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 A125085 #5 Jul 14 2012 13:29:16 %S A125085 1,3,31,159,2347,6549,73111,107621,601279,631387,1003101,6976007, %T A125085 11110539,26126311,5421178993 %N A125085 Indices n corresponding to the terms in A153353. %K A125085 nonn %O A125085 1,2 %A A125085 _Robert G. Wilson v_, Jan 23 2009 %E A125085 a(15) from _Donovan Johnson_, Aug 08 2010