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 A069968 #6 May 11 2007 03:00:00 %S A069968 2,3,4,5,8,7,15,14,21,11,35,13,33,26,55,17,65,19,51,38,53,23,95,46,69 %N A069968 Duplicate of A056240. %K A069968 dead %O A069968 2,1