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 A138485 #3 Aug 24 2012 10:50:01
%S A138485 1,11,21,1112,1231,211312,223113,232122,421113,13311214,14411223,
%T A138485 13223124,14322123,23322114,14213223,23322114,14213223,23322114,
%U A138485 14213223,23322114,14213223,23322114,14213223,23322114,14213223
%N A138485 Say what you see in previous term, from the right, reporting total number for each digit encountered. Initial term is 1.
%C A138485 After a while sequence has period 2 -> {23322114,14213223}
%e A138485 To get the term after 211312, we say: two 2's, three 1's, one 3's, so 223113.
%Y A138485 Cf. A063850, A022482, A005150, A005151, A006751, A006715, A006711, A022506-A022513, A138484, A138486-A138493.
%K A138485 easy,nonn,base
%O A138485 0,2
%A A138485 _Paolo P. Lava_ and _Giorgio Balzarotti_, Mar 20 2008