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

3,5

Links

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

Crossrefs

Column k=2 of A245151.

Sequence in context: A092481 A099508 A141577 * A123315 A237113 A293937

Adjacent sequences: A245139 A245140 A245141 * A245143 A245144 A245145

Keyword

nonn

Author

Alois P. Heinz, Jul 12 2014

Status

approved