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%I #12 Nov 24 2019 09:58:27
%S 0,2,4,10,14,16,28,58,86,104,124,518,604,1276,2200,2278,3214,4250,
%T 4420,9686,9938,11210,19934,21698,23206,44494,86240,110500,132046,
%U 216088,756836,859430,1257784,1398266,2976218,3021374,6972590,13466914
%N a(n) = A000043(n) - 3.
%C 2^a(n)-1 is divisible by 3. For (2^a(n)-1)/3 see A124477.
%C For a(n)/2 see A139481.
%Y Cf. A000043, A000668, A124477, A139479, A139481.
%K nonn
%O 2,2
%A _Artur Jasinski_, Apr 22 2008
%E Definition corrected by _Omar E. Pol_, May 23 2008
%E Edited by _N. J. A. Sloane_, May 23 2008
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