Number of rooted identity trees with n nodes and exactly 2 subtrees from the root.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =11a(5) =22a(6) =49a(7) =104a(8) =232a(9) =513a(10) =1159a(11) =2619a(12) =5989a(13) =13734a(14) =31729a(15) =73555a(16) =171377a(17) =400631a(18) =940104a(19) =2212542a(20) =5222932a(21) =12360976a(22) =29327260a(23) =69735757a(24) =166170966a(25) =396727768a(26) =948897250a(27) =2273409345a(28) =5455374972a(29) =13110384631