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 A097658 #5 Jan 09 2009 03:00:00 %S A097658 0,9,24,45,72,105,144,189,240,297,360,429,504,585,672,765,864,969,1080 %N A097658 Duplicate of A067725. %K A097658 dead %O A097658 0,2