%I #2 Mar 30 2012 18:57:10
%S 1,1,2,2,3,4,7,10,16,24,36,54,80,120,180,269,404,605,908,1361,2041,
%T 3063,4591,6890,10333,15509,23259,34901,52344,78516,117762,176636,
%U 264944,397405,596099,894193,1341290,2011935,3017927,4526825
%N Length of row n of A143589 (a Kolakoski fan).
%C Conjecture (following Benoit Cloitre's conjecture at A111090):
%C if L=A143489, then L(n)*(2/3)^n approaches a constant.
%e The first 6 rows of A143589 are 1; 2; 1,1; 2,1; 1,1,2; 2,1,2,2. Their
%e lengths are 1,1,2,2,3,4.
%Y Cf. A000002, A111090, A143477, A143586, A143489.
%K nonn
%O 1,3
%A _Clark Kimberling_, Aug 25 2008