Number of complete compositions of n.

Terms

a(0) =1a(1) =1a(2) =3a(3) =4a(4) =8a(5) =18a(6) =33a(7) =65a(8) =127a(9) =264a(10) =515a(11) =1037a(12) =2052a(13) =4103a(14) =8217a(15) =16408a(16) =32811a(17) =65590a(18) =131127a(19) =262112a(20) =524409a(21) =1048474a(22) =2097319a(23) =4194250a(24) =8389414a(25) =16778024a(26) =33557921a(27) =67116113a(28) =134235473a(29) =268471790