A135157 - OEIS

A135157

Number of primitive (no repeated characters) and irreducible (not the concatenation of generatable strings) strings obtained from abc by iterated repetition of substrings in place.

%I #6 Jan 21 2014 12:30:21

%S 1,0,2,0,3,1,4,0,5,2,6,0,7,3,8,0,9,6,10,0,11,12,12,4,13,24,14,23,15,

%T 54,16,91,17,149,18,326,19,484,20,1144,21,1741,22,4015,23,6589,24,

%U 14296,25,25299,26,52077,27,97264,28,193781,29,373996,30,733076

%N Number of primitive (no repeated characters) and irreducible (not the concatenation of generatable strings) strings obtained from abc by iterated repetition of substrings in place.

%H <a href="/index/Do#repeat">Index entries for doubling substrings</a>

%Y Cf. A135473, A135156.

%K nonn

%O 0,3

%A _David Applegate_ and _N. J. A. Sloane_, Feb 15 2008