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%I #2 Mar 30 2012 18:59:12
%S 1,2,5,6,13,14,25,30,49,50,97,98,165,186,325,326,621,622,1161,1230,
%T 2257,2258,4481,4498,8597,8858,17125,17126,34077,34078,66985,68014,
%U 133553,133634,267057,267058,529205,533306,1058261,1058262,2115133
%N Expansion of (1/(1-x))*sum(k>=2,x^k/(1-2x^k)).
%F a(n)=sum{k=0..floor(n/2), floor((n-k+1)/(k+1))*2^k}.
%Y Cf. A002541.
%K easy,nonn
%O 0,2
%A _Paul Barry_, Oct 19 2005
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