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 A160771 #15 Dec 03 2014 23:11:33 %S A160771 3,5,9,11,15,17,21,27,29,35,39,41,45,49,51,55,57 %N A160771 Erroneous version of A040976. %K A160771 dead %O A160771 3,1