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 A022513 #8 Oct 27 2015 02:32:29 %S A022513 9,19,1911,211911,21192112,122112192112,122112191112212211, %T A022513 2122112231191112212211,21221122311921132221221112, %U A022513 12312211321321121921132221221112 %N A022513 Describe previous term from the right (method A - initial term is 9). %C A022513 Method A = 'frequency' followed by 'digit'-indication. %e A022513 E.g., the term after 1911 is obtained by saying "two 1's, one 9, one 1", which gives 211911. %Y A022513 Cf. A005150, A022506, A006711, A022482, A022507-A022512. %K A022513 nonn,base,easy,nice %O A022513 0,1 %A A022513 _N. J. A. Sloane_ %E A022513 More terms from _Erich Friedman_