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 A071158 #7 Sep 08 2013 02:56:03 %S A071158 1,11,21,111,121,211,221,321,1111,1121,1211,1221,1321,2111,2121,2211, %T A071158 2221,2321,3211,3221,3321,4321,11111,11121,11211,11221,11321,12111, %U A071158 12121,12211,12221,12321,13211,13221,13321,14321,21111,21121,21211 %N A071158 Factorial expansion of A071156. %C A071158 Note that this decimal representation works only as long as there does not appear any digit 'ten' or higher in the factorial expansion of A071156. %H A071158 A. Karttunen, <a href="/A014486/a014486.ps.gz">Illustration of 626 initial terms (up to seven digits) showing a simple bijection with non-crossing Murasaki-diagrams</a> %Y A071158 a(n) = A007623(A071156(n)) = A071157(A057164(n)). %K A071158 nonn,base %O A071158 1,2 %A A071158 _Antti Karttunen_, May 14 2002