Inverse Weigh transform of 2^n.

Terms

a(0) =2a(1) =3a(2) =2a(3) =6a(4) =6a(5) =11a(6) =18a(7) =36a(8) =56a(9) =105a(10) =186a(11) =346a(12) =630a(13) =1179a(14) =2182a(15) =4116a(16) =7710a(17) =14588a(18) =27594a(19) =52482a(20) =99858a(21) =190743a(22) =364722a(23) =699216a(24) =1342176a(25) =2581425a(26) =4971008a(27) =9587574a(28) =18512790a(29) =35792449