A245142 - OEIS

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A245142

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

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

(list; graph; refs; listen; history; text; internal format)

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