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 A174831 #8 Aug 24 2012 10:50:03 %S A174831 0,1,11,13,1401,26011,3811101,4121210101,61622201010001, %T A174831 1119522020100010001,1922822120100110001001, %U A174831 27281122120200110001002001,37331622120200210001002001000011 %N A174831 a(n) is the concatenation of the frequency of 0's, 1's, 2's etc. in the entries a(0) up to a(n-1). %C A174831 Like A006920 but starting from a(0)=0. %H A174831 <a href="/index/Sa#swys">Index to sequences related to 'say what you see'</a> %e A174831 a(2) = 1|1 because there is 1 zero and 1 one in the entries a(0) and a(1). %e A174831 a(3) = 1|3 because there are 1 zero and 3 ones in the entries a(0) to a(2). %e A174831 a(7) = 4|12|1|2|1|0|1|0|1 because there are 4 zeros, 12 ones, 1 two, 2 threes, 1 four, 0 fives,..., 1 eight in the entries a(0) to a(6). %Y A174831 Cf. A006920, A177359 %K A174831 easy,nonn,base %O A174831 0,3 %A A174831 _Paolo P. Lava_ and _Giorgio Balzarotti_, Mar 30 2010 %E A174831 Definition corrected by _Paolo P. Lava_, Apr 04 2010 %E A174831 Definition rephrased, examples added, keyword:base added - _R. J. Mathar_, Aug 10 2010