A245142 Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 2.

1, 0, 1, 1, 3, 3, 8, 9, 21, 28, 56, 81, 159, 237, 444, 701, 1273, 2060, 3699, 6099, 10840, 18180, 32079, 54417, 95787, 163868, 287914, 496171, 871270, 1509676, 2652068, 4615810, 8114578, 14176261, 24947471, 43718822, 77031659, 135350915, 238791685, 420544851

Offset: 3

Author

Alois P. Heinz, Jul 12 2014

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 3..150

Crossrefs

Column k=2 of A245151.