%I A013950
%S A013950 1,2,3,4,6,9,12,16,22,31,42,56,76,105,142,190,258,353,476,640,870,1183,
%T A013950 1594,2152,2924,3961,5342,7230,9810,13265,17916,24272,32886,44447,60106,
%U A013950 81432,110220,149001,201646,273086,369442,499649,676380,915616,1238534
%N A013950 Start with 1, apply 1->12, 21->21, 22->21, 2->2 (for final 2); a(n) = 
               length of n-th term.
%Y A013950 Cf. A013949.
%Y A013950 Sequence in context: A001935 A083365 A007604 this_sequence A018550 A035952 
               A105781
%Y A013950 Adjacent sequences: A013947 A013948 A013949 this_sequence A013951 A013952 
               A013953
%K A013950 nonn
%O A013950 1,2
%A A013950 Clark Kimberling (ck6(AT)evansville.edu)