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%I #4 Mar 30 2012 18:56:06
%S 1,2,3,2,4,5,3,6,7,8,9,4,10,11,5,12,13,14,15,6,16,17,7,18,19,8,20,21,
%T 9,22,23,24,25,10,26,27,11,28,29,30,31,12,32,33,13,34,35,14,36,37,15,
%U 38,39,40,41,16,42,43,17,44,45,46,47,18,48,49
%N a(n) = a(m) if a(m) has already occurred exactly once and n = a(m)+2m-2, else a(n) = least positive integer that has not yet occurred.
%K nonn
%O 1,2
%A _Clark Kimberling_
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