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 A137908 #24 Oct 30 2014 07:19:36 %S A137908 1,3,1,7,8,19,13,4,16,3,42,24,434,84,160,579,475,529,2450,2644,3928, %T A137908 558,13680,7146,1408,3003,2369,55000,83873 %N A137908 Duplicate of A121370. %K A137908 dead %O A137908 1,2