%I #4 Mar 30 2012 18:56:06
%S 1,1,2,3,2,3,4,5,6,7,4,5,8,6,7,9,10,11,12,8,13,14,15,9,16,10,11,17,12,
%T 18,19,13,14,20,15,21,22,16,23,24,25,17,26,27,18,28,19,29,30,31,20,32,
%U 33,21,34,22,35,36,23,24,37,25,38,39,26,27
%N a(n) = a(m) if a(m) has already occurred exactly once and n = m+[ (m+1)/2 ], else a(n) = least positive integer that has not yet occurred.
%K nonn
%O 1,3
%A _Clark Kimberling_
