%I #3 Jul 05 2012 10:37:52
%S 2,1,21,121,21121,12121121,2112112121121,121211212112112121121,
%T 2112112121121121211212112112121121,
%U 1212112121121121211212112112121121121211212112112121121,21121121211211212112121121121211211212112121121121211212112112121121121211212112112121121
%N a(n) = n-th term of A106750 reversed.
%C Arises in analyzing factors of A003842.
%H M. Lothaire, <a href="http://www-igm.univ-mlv.fr/~berstel/Lothaire/">Algebraic Combinatorics on Words</a>, Cambridge, 2002
%Y Cf. A003842, A106750, A213975.
%K nonn
%O 0,1
%A _N. J. A. Sloane_, Jul 05 2012