Number of odd composites between 2^n and 2^(n + 1).

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =3a(5) =9a(6) =19a(7) =41a(8) =85a(9) =181a(10) =375a(11) =769a(12) =1584a(13) =3224a(14) =6580a(15) =13354a(16) =27059a(17) =54521a(18) =110682a(19) =223509a(20) =450702a(21) =908240a(22) =1828936a(23) =3680596a(24) =7402790a(25) =14883096a(26) =29908688a(27) =60081574a(28) =120655821a(29) =242228178