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 A129968 #4 Mar 30 2012 16:50:41 %S A129968 1,2,3,1,2,3,4,2,3,4,3,4,1,2,3,4,2,3,4,5,3,4,5,4,2,3,4,3,4,5,4,5,3,4, %T A129968 4,5,1,2,3,4,2,3,4,5,3,4,5,4,5,2,3,4,5,3,4,5,6,4,5,6,5,3,4,5,4,5,6,5, %U A129968 4,5,2,3,4,3,4,5,4,5,6,3,4,5,4,5,5,6,4,5,6,5,6,3,4,4,5,4,5,5,6,1,2,3,4,2,3 %N A129968 a(n) = sum of digits of A061909(n). %H A129968 T. D. Noe, <a href="/A129968/b129968.txt">Table of n, a(n) for n=1..5000</a> %K A129968 nonn,base %O A129968 1,2 %A A129968 _N. J. A. Sloane_, Jun 13 2007