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 A103703 #2 Mar 30 2012 17:31:12
%S A103703 1,5,9,13,5,7,9,11,13,5,5,5,7,9,9,9,11,13,13,13,5,5,5,7,5,7,5,7,9,9,9,
%T A103703 11,9,11,9,11,13,13,13,5,5,13,5,5,13,5,5,5,7,5,7,5,7,9,9,5,7,9,9,5,7,
%U A103703 9,9,9,11,9,11,9,11,13,13,9,11,13,13,9,11,13,13,13,5,5,13,5,5,13,5,5,5,7
%N A103703 Add 4 to each of the preceding digits, beginning with 1.
%t A103703 Flatten[ NestList[ Function[x, Flatten[ IntegerDigits[x] + 4]], {1}, 22]]
%Y A103703 Cf. A103696, A103701, A103702, A103704, A103705, A103706, A103707, A103708.
%K A103703 base,nonn
%O A103703 1,2
%A A103703 _Robert G. Wilson v_, Feb 12 2005