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 A108637 #3 May 11 2007 03:00:00 %S A108637 9,15,33,35,39,51,55,57,77,91,93,95,111,115,119,133,155,159,177,319, %T A108637 335 %N A108637 Duplicate of A091296. %K A108637 dead %O A108637 1,1