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 A144530 #3 Mar 30 2012 16:51:00 %S A144530 0,1,2,6,14,37,88 %N A144530 Final diagonal of triangle in A144529. %K A144530 nonn,more %O A144530 1,3 %A A144530 _N. J. A. Sloane_, Dec 20 2008