Number of powerful rooted trees with n nodes.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =6a(6) =11a(7) =13a(8) =22a(9) =29a(10) =46a(11) =57a(12) =94a(13) =115a(14) =180a(15) =230a(16) =349a(17) =435a(18) =671a(19) =830a(20) =1245a(21) =1572a(22) =2320a(23) =2894a(24) =4287a(25) =5328a(26) =7773a(27) =9752a(28) =14066a(29) =17547