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 A103702 #2 Mar 30 2012 17:31:12
%S A103702 1,4,7,10,4,3,7,6,10,9,4,3,12,7,6,4,5,10,9,7,8,4,3,12,10,11,7,6,4,5,4,
%T A103702 3,4,4,10,9,7,8,7,6,7,7,4,3,12,10,11,10,9,10,10,7,6,4,5,4,3,4,4,4,3,
%U A103702 12,4,3,4,3,10,9,7,8,7,6,7,7,7,6,4,5,7,6,7,6,4,3,12,10,11,10,9,10,10,10,9,7
%N A103702 Add 3 to each of the preceding digits, beginning with 1.
%t A103702 Flatten[ NestList[ Function[x, Flatten[ IntegerDigits[x] + 3]], {1}, 22]]
%Y A103702 Cf. A103695, A103701, A103703, A103704, A103705, A103706, A103707, A103708.
%K A103702 base,nonn
%O A103702 1,2
%A A103702 _Robert G. Wilson v_, Feb 12 2005