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 A112514 #1 Sep 21 2005 03:00:00
%S A112514 4,14,1114,3114,132114,31131214,23411214,22132431,32212314,23322114,
%T A112514 32232114,23322114,32232114,23322114,32232114,23322114,32232114,
%U A112514 23322114,32232114
%N A112514 Say what you see in previous term, same as A063850 but starting with 4.
%C A112514 Eventually periodic.
%o A112514 (Perl) #!/usr/bin/perl -l use strict; use warnings; die "Usage: $0 <number>" unless @ARGV==1; $_=shift; { print; my (%cnt, %saw); $cnt{$_}++ for /./g; s/./ $saw{$&}++ ? '' : $cnt{$&} . $& /ge; <>, redo; } __END__
%Y A112514 Cf. A005150, A005151, A063850, A112512-A112515.
%K A112514 base,easy,nonn
%O A112514 1,1
%A A112514 Michele Dondi (blazar(AT)lcm.mi.infn.it), Sep 09 2005