Number of 6-almost primes 6ap such that 2^n < 6ap <= 2^(n+1).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =1a(7) =5a(8) =8a(9) =22a(10) =44a(11) =96a(12) =215a(13) =439a(14) =959a(15) =1967a(16) =4185a(17) =8735a(18) =18143a(19) =37695a(20) =77939a(21) =161479a(22) =332008a(23) =684502a(24) =1404867a(25) =2882712a(26) =5904454a(27) =12078654a(28) =24682057a(29) =50375102