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a(2n) = a(n), a(2n+1) = 4n+1.
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%I #3 Mar 30 2012 18:41:21

%S 0,1,1,5,1,9,5,13,1,17,9,21,5,25,13,29,1,33,17,37,9,41,21,45,5,49,25,

%T 53,13,57,29,61,1,65,33,69,17,73,37,77,9,81,41,85,21,89,45,93,5,97,49,

%U 101,25,105,53,109,13,113,57,117,29,121,61,125,1,129,65,133,33,137

%N a(2n) = a(n), a(2n+1) = 4n+1.

%F a(n) = 2n/2^A007814(n) - 1.

%Y Equals 2*A000265(n) - 1.

%K nonn,easy

%O 0,4

%A _Ralf Stephan_, May 28 2007