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 A088649 #3 May 11 2007 03:00:00 %S A088649 1,3,7,9,13,19,21,27,31,33,37,43,49,51,57,63,69,73,79,87,91,97,99,103 %N A088649 Duplicate of A020498. %K A088649 dead %O A088649 1,2