A193488 Number of rooted trees with n nodes and omega-valency 3.

0, 0, 0, 0, 1, 1, 6, 11, 42, 92, 294, 720, 2119, 5460, 15477, 40989, 114165, 306980, 848268, 2301794, 6341450, 17308926, 47659837, 130628590, 359924353, 989642184, 2730224431, 7526539869, 20795818601, 57457010219

Offset

1,7

Comments

See A003120 for definitions.

Links

Table of n, a(n) for n=1..30.

J.-C. Arditti, Dénombrement des arborescences dont le graphe de comparabilité est Hamiltonien, Discrete Math., 5 (1973), 189-200.

Crossrefs

Cf. A003120, A193487, A193489, A193490, A193491.

Sequence in context: A288822 A015440 A253209 * A270223 A270691 A270280

Adjacent sequences: A193485 A193486 A193487 * A193489 A193490 A193491

Keyword

nonn

Author

N. J. A. Sloane, Jul 27 2011

Status

approved