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 A169789 #2 Mar 30 2012 16:51:45 %S A169789 0,0,1,7,37,167,707,2907,11787,47469,190525 %N A169789 A169788(2^n). %K A169789 nonn %O A169789 0,4 %A A169789 _N. J. A. Sloane_, May 13 2010