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 A177361 #9 May 01 2013 21:13:45 %S A177361 2,12,1122,3142,41521314,7162233415,91824344251617, %T A177361 12110253743526271819,1017114273845536472829,20211172931147546774839, %U A177361 3026120211314485561175859,50321232133164125761277869,603712821731741451061578879,8043130219319416512620711889 %N A177361 a(n) contains the nonzero frequencies f(d) of digits d=0 .. 9 in all terms up to a(n-1) in concatenated form sorted with respect to d: f(0)//0//f(1)//1//...//f(9)//9. Initial term a(1)=2. %C A177361 For a Mathematica program, see A177360 (you have to slightly modify it) [From Jasper Mulder (jasper.mulder(AT)planet.nl), Jun 04 2010] %H A177361 J. Mulder, <a href="/A177361/b177361.txt">Table of n, a(n) for n = 1..25000</a> %e A177361 Two; one two; one one, two twos; three ones, four twos; four ones, five twos, one three, one four; seven ones, six twos, two threes, three fours, one five; etc. %Y A177361 Cf. A060857, A177359 - A177368 %K A177361 easy,nonn,base %O A177361 1,1 %A A177361 _Paolo P. Lava_ and _Giorgio Balzarotti_, May 10 2010 %E A177361 Terms corrected using values in b-file. - _N. J. A. Sloane_, Oct 05 2010