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 A069885 #3 May 11 2007 03:00:00 %S A069885 1,2,7,11,101,111,1001,10001,10101,11011,100001,101101,110011,1000001 %N A069885 Duplicate of A069748. %K A069885 dead %O A069885 1,2