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A245143 Number of n-node unlabeled rooted trees with thickening limbs and root outdegree (branching factor) 3. 2
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 (list; graph; refs; listen; history; text; internal format)
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 * A104220 A321986 A209083

Adjacent sequences:  A245140 A245141 A245142 * A245144 A245145 A245146

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Jul 12 2014

STATUS

approved

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Last modified January 20 02:13 EST 2019. Contains 319320 sequences. (Running on oeis4.)