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 A070240 #4 May 11 2007 03:00:00 %S A070240 1,2,5,9,10,11,16,17,19,21,22,23,25,26,27,29,33,34,35,37,41,43,45,46, %T A070240 47 %N A070240 Duplicate of A007369. %K A070240 dead %O A070240 1,2