%I #14 Oct 15 2019 11:51:51
%S 1,8,4,2,20,10,5,32,16,40,44,22,11,56,28,14,7,3,76,38,19,9,92,46,23,
%T 104,52,26,13,6,124,62,31,15,140,70,35,17,156,78,39,168,84,42,21,184,
%U 188,94,47,200,100,50,25,12,220,110,55,27,236
%N a(1) = 1, a(n) = floor(a(n-1)/2) if this is not among 0,a(1),...,a(n-1); otherwise a(n) = 4*n.
%C Does this sequence contain every positive integer exactly once?
%Y Cf. A050000.
%K nonn
%O 1,2
%A _Clark Kimberling_
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