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 A022505 #18 Mar 20 2021 13:16:12 %S A022505 9,91,9111,9113,911231,9112213111,911222113113,91122312311231, %T A022505 9112223111213112213111,91122331132111311222113113, %U A022505 911222321231211331122312311231 %N A022505 Describe the previous term! (method B - initial term is 9). %C A022505 Method B = 'digit'-indication followed by 'frequency'. %e A022505 E.g., the term after 9113 is obtained by saying "9 once, 1 twice, 3 once", which gives 911231. %Y A022505 Cf. A007651, A022470, A022499, A022500, A022501, A022502, A022503, A022504. %K A022505 nonn,base,easy,nice %O A022505 1,1 %A A022505 _N. J. A. Sloane_ %E A022505 a(12)-(14) needlessly added by _Alvin Hoover Belt_, Jan 31 2010