Number of practical numbers not exceeding 2^n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =7a(5) =13a(6) =21a(7) =36a(8) =61a(9) =113a(10) =202a(11) =368a(12) =667a(13) =1218a(14) =2268a(15) =4222a(16) =7959a(17) =15057a(18) =28480a(19) =53742a(20) =101770a(21) =193406a(22) =368610a(23) =703596a(24) =1347122a(25) =2587174a(26) =4981200a(27) =9602184a(28) =18548787a(29) =35847883