Fluctuations of the number of cubefree integers not exceeding 2^n.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =0a(6) =1a(7) =1a(8) =1a(9) =1a(10) =2a(11) =2a(12) =3a(13) =0a(14) =-1a(15) =-1a(16) =1a(17) =2a(18) =0a(19) =-1a(20) =0a(21) =2a(22) =6a(23) =1a(24) =2a(25) =7a(26) =5a(27) =-1a(28) =-7a(29) =-4