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 A063879 #3 May 11 2007 03:00:00 %S A063879 1387,1849,2117,4307,8299,34547,35947,38491,68753,69679,84281,90637 %N A063879 Duplicate of A063172. %K A063879 dead %O A063879 1,1