Number of powerful uniform rooted trees with n nodes.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =6a(6) =11a(7) =12a(8) =19a(9) =23a(10) =35a(11) =36a(12) =63a(13) =64a(14) =98a(15) =112a(16) =173a(17) =174a(18) =291a(19) =292a(20) =473a(21) =509a(22) =791a(23) =792a(24) =1345a(25) =1356a(26) =2158a(27) =2257a(28) =3634a(29) =3635