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 A140108 #16 Apr 15 2013 07:13:23 %S A140108 1,2,3,7,11,31,57,148,312,754,1559,3844 %N A140108 Duplicate of A034295. %K A140108 dead %O A140108 1,2