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 A177362 #7 Aug 24 2012 10:50:03 %S A177362 3,13,1123,311233,512263,6142731516,91528314253617, %T A177362 12172103244546271819,10171112113545556472829,20241142123749566673839, %U A177362 3027118215310410596874859,603212021731241351061077879 %N A177362 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)=3. %C A177362 For a Mathematica program, see A177360 (you have to slightly modify it) [From Jasper Mulder (jasper.mulder(AT)planet.nl), Jun 04 2010] %H A177362 J. Mulder, <a href="/A177362/b177362.txt">Table of n, a(n) for n = 1..25000</a> %e A177362 Three; one three; one one, two threes; three ones, one two, three threes; five ones, two twos, six threes; six ones, four twos, seven threes, one five, one six; etc. %Y A177362 Cf. A060857, A177359 - A177368. %K A177362 easy,nonn,base %O A177362 1,1 %A A177362 _Paolo P. Lava_ and _Giorgio Balzarotti_, May 10 2010