A193489 Number of rooted trees with n nodes and omega-valency 4.

0, 0, 0, 0, 0, 1, 1, 7, 13, 55, 127, 435, 1110, 3458, 9261, 27460, 75305, 217619, 603618, 1720712, 4799095, 13580179, 37979149, 107045222, 299800569, 843242264, 2363693561, 6641675073, 18628827667, 52325428340

Offset

1,8

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: A108056 A018562 A112540 * A091005 A015441 A255286

Adjacent sequences: A193486 A193487 A193488 * A193490 A193491 A193492

Keyword

nonn

Author

N. J. A. Sloane, Jul 27 2011

Status

approved