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a(n) = c([ (n+1)/2 ]) + n, with a(1) = 1 and a(2) = 4, c = complement to a.
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%I #4 Mar 30 2012 18:55:53

%S 1,4,6,7,10,11,15,16,18,19,23,24,26,27,29,30,34,35,39,40,42,43,45,46,

%T 50,51,55,56,60,61,63,64,66,67,71,72,74,75,77,78,82,83,87,88,92,93,95,

%U 96,98,99,103,104,106,107,109,110,114,115,117,118,120,121,125

%N a(n) = c([ (n+1)/2 ]) + n, with a(1) = 1 and a(2) = 4, c = complement to a.

%K nonn

%O 1,2

%A _Clark Kimberling_