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 A080826 #9 Mar 30 2023 07:09:54 %S A080826 122,12,1122,11212212,1121221122121122, %T A080826 11212211221211212212112211212212, %U A080826 1121221122121121221211221121221122121122112122121121221122121122 %N A080826 Successive factors of the Thue-Morse word defined by sequence A001285. %C A080826 The next term is too large to include. %H A080826 G. Melançon, <a href="http://www.lirmm.fr/~melancon/">Home page</a> [Dead link] %H A080826 G. Melançon, <a href="http://citeseer.ist.psu.edu/114959.html">Lyndon Factorization of Infinite Words</a> STACS 96 (Grenoble, 1996), 147-154, Lecture Notes in Comput. Sci., 1046, Springer, Berlin, 1996. %p A080826 A080826:= proc(n) option remember: local l,i: if n = 0 then RETURN([1,2,2]) else l:=A080826(n-1):l := subsop(nops(l)=NULL,l):RETURN([op(l),seq(op(A080826(i)),i=0..n-2)]) fi:end; ds:=s->add(s[j]*10^(nops(s)-j),j=1..nops(s)); seq(ds(A080826(n)),n=0..7); (C. Ronaldo) %K A080826 nonn,easy %O A080826 1,1 %A A080826 _N. J. A. Sloane_, Mar 28 2003 %E A080826 More terms from C. Ronaldo (aga_new_ac(AT)hotmail.com), Dec 19 2004