Number of non-biquanimous subsets of {1..n} containing n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =12a(5) =22a(6) =44a(7) =84a(8) =163a(9) =314a(10) =610a(11) =1184a(12) =2308a(13) =4505a(14) =8843a(15) =17386a(16) =34336a(17) =67881a(18) =134662a(19) =267431a(20) =532172a(21) =1060048a(22) =2113947a(23) =4218325a(24) =8423138a(25) =16826162a(26) =33623311a(27) =67205646a(28) =134351795a(29) =268621562