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 A101829 #12 Feb 27 2012 17:45:12 %S A101829 5,7,893,1523 %N A101829 Duplicate of A056252. %K A101829 dead %O A101829 1,1