Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 2.

A245142

Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 2.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =1a(4) =3a(5) =3a(6) =8a(7) =9a(8) =21a(9) =28a(10) =56a(11) =81a(12) =159a(13) =237a(14) =444a(15) =701a(16) =1273a(17) =2060a(18) =3699a(19) =6099a(20) =10840a(21) =18180a(22) =32079a(23) =54417a(24) =95787a(25) =163868a(26) =287914a(27) =496171a(28) =871270a(29) =1509676

External references