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%I #4 Mar 30 2012 18:41:20
%S 0,1,4,3,7,5,8,7,12,9,12,11,15,13,16,15,21,17,20,19,23,21,24,23,28,25,
%T 28,27,31,29,32,31,38,33,36,35,39,37,40,39,44,41,44,43,47,45,48,47,53,
%U 49,52,51,55,53,56,55,60,57,60,59,63,61,64,63,71,65,68,67,71
%N Exponent of 2 in (3^n-3)*2^n.
%F Recurrence: a(2n) = a(n) + [(n+1)/2] + 1, a(2n+1) = 2n+1.
%o (PARI) a(n)=if(n<1,0,if(n%2==0,a(n/2)+2*floor((n+2)/4)+1,n)
%Y a(n) is the exponent of 2 in A009613(n), A010043(n), A010046(n), A012388(n-1), A009518(n), A012391(n-1), A012457(n-1), A012458(n-1), A012461(n-1), A012462(n-2).
%Y Cf. A093050, A093052.
%K nonn
%O 0,3
%A _Ralf Stephan_, Mar 16 2004
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