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 A151690 #2 Mar 30 2012 16:51:05 %S A151690 1,3,2,3,8,8,3,3,8,8,9,20,25,15,4,3,8,8,9,20,25,15,10,20,25,27,50,71, %T A151690 56,24,5,3,8,8,9,20,25,15,10,20,25,27,50,71,56,24,11,20,25,27,50,71, %U A151690 56,36,51,71,80,128,193,184,105,35,6,3,8,8,9,20,25,15,10,20,25,27,50,71,56,24 %N A151690 A151689/2. %K A151690 nonn %O A151690 0,2 %A A151690 _N. J. A. Sloane_, Jun 04 2009