Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 4.

A244458

Number of unlabeled rooted trees with n nodes such that the minimal outdegree of inner nodes equals 4.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =2a(6) =2a(7) =2a(8) =4a(9) =7a(10) =12a(11) =16a(12) =25a(13) =38a(14) =61a(15) =94a(16) =147a(17) =227a(18) =356a(19) =550a(20) =862a(21) =1345a(22) =2113a(23) =3299a(24) =5168a(25) =8091a(26) =12721a(27) =19981a(28) =31421a(29) =49384

External references