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 A022503 #9 Jan 05 2018 22:02:07 %S A022503 7,71,7111,7113,711231,7112213111,711222113113,71122312311231, %T A022503 7112223111213112213111,71122331132111311222113113, %U A022503 711222321231211331122312311231 %N A022503 Describe the previous term! (method B - initial term is 7). %C A022503 Method B = 'digit'-indication followed by 'frequency'. %H A022503 Seiichi Manyama, <a href="/A022503/b022503.txt">Table of n, a(n) for n = 1..23</a> %e A022503 E.g. the term after 7113 is obtained by saying "7 once, 1 twice, 3 once", which gives 711231. %Y A022503 Cf. A007651, A022470, A022499, A022500-A022505. %K A022503 nonn,base,easy,nice %O A022503 1,1 %A A022503 _N. J. A. Sloane_