A245143 Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 3.

1, 0, 0, 1, 1, 1, 3, 3, 5, 9, 12, 17, 32, 42, 64, 106, 157, 232, 379, 563, 866, 1362, 2081, 3186, 5028, 7710, 11924, 18659, 28938, 44842, 70254, 109245, 170266, 266562, 416378, 650513, 1020431, 1597803, 2504070, 3932672, 6174777, 9698203, 15258753, 24005178

Offset

4,7

Links

Alois P. Heinz, Table of n, a(n) for n = 4..150

Crossrefs

Column k=3 of A245151.

Sequence in context: A078028 A317142 A279375 * A350393 A325849 A104220

Adjacent sequences: A245140 A245141 A245142 * A245144 A245145 A245146

Keyword

nonn

Author

Alois P. Heinz, Jul 12 2014

Status

approved