Number of powerful numbers between 2^(n-1)+1 and 2^n.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =3a(6) =3a(7) =7a(8) =8a(9) =12a(10) =17a(11) =25a(12) =36a(13) =50a(14) =74a(15) =105a(16) =152a(17) =213a(18) =306a(19) =437a(20) =620a(21) =882a(22) =1256a(23) =1781a(24) =2531a(25) =3588a(26) =5091a(27) =7221a(28) =10225a(29) =14504