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

Author

N. J. A. Sloane, Jul 27 2011

Keywords

• nonn

Comments

See A003120 for definitions.

Links

• 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.