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 A033929 #3 Oct 14 2012 12:58:14 %S A033929 1,1,2,3,4,5,6,7,8,1,2,3,4,5,6,7,8,9,2,3,4,5,6,7,8,9,10,3,4,5,6,7,8,9, %T A033929 10,11,4,5,6,7,8,9,10,11,12,5,6,7,8,9,10,11,12,13,6,7,8,9,10,11,12,13, %U A033929 14,7,8,9,10,11,12,13,14,15,8,9,10,11,12,13,14,15,16,2,3,4,5,6,7,8,9 %N A033929 Base 9 digital convolution sequence. %F A033929 For example, 611 = 748 in base 9, so a(611) = 7a(2)+4a(1)+8a(0). %K A033929 nonn,base %O A033929 1,3 %A A033929 _David W. Wilson_