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 A052500 #4 Mar 30 2012 16:48:44 %S A052500 0,1,2,3,4,5,6,7,8,9,1,10,1,2,3,4,5,6,7,8,2,1,20,1,2,3,4,5,6,7,3,2,1, %T A052500 30,1,2,3,4,5,6,4,3,2,1,40,1,2,3,4,5,5,4,3,2,1,50,1,2,3,4,6,5,4,3,2,1, %U A052500 60,1,2,3,7,4,5,4,3,2,1,70,1,2,8,3,6,5,4,3,2,1,80,1,9,2,7,6,5,4,3,2,1 %N A052500 A052484 / 9. %K A052500 nonn,base,easy %O A052500 0,3 %A A052500 _N. J. A. Sloane_, Mar 18 2000 %E A052500 More terms from Larry Reeves (larryr(AT)acm.org), Oct 02 2000