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a(n) gives the least i, for which A166085(i) = 2n.
2

%I #2 Mar 31 2012 13:21:20

%S 0,1,3,5,7,15,26,13,62,33,11,35,25,55,59,43,130,71,49,29,99,67,74,167,

%T 79,85,89,95,146,121,316,47,574,115,65,399,127,31,157,199,83,309,81,

%U 193,592,235,137,197,358,277,395,271,191,351,563,119,433,347,229,61

%N a(n) gives the least i, for which A166085(i) = 2n.

%Y a(n) = (A166090(n)-1)/4. See also A166094, A166095.

%K nonn

%O 0,3

%A _Antti Karttunen_, Oct 08 2009