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 A101019 #11 Feb 27 2012 17:46:46 %S A101019 5,71,95,113,203,983,1225 %N A101019 Duplicate of A056266. %K A101019 dead %O A101019 1,1