A297201 Related to label-increasing forests with branching bounded by 4.

1, 2, 4, 10, 34, 148, 786, 4920, 35446, 288822, 2625844, 26349340, 289248224, 3447860798, 44348374106, 612228009210, 9028698146956, 141655958846642, 2355980548168314, 41403643674710280, 766627753698325214

Offset

0,2

Comments

Sequence C_n(2) in Riordan 1978 or 1979.

Links

Table of n, a(n) for n=0..20.

John Riordan, Forests of label-increasing trees, annotated scanned copy of 1978 pre-publication version.

John Riordan, Forests of label-increasing trees, J. Graph Theory, 3 (1979), 127-133.

Formula

E.g.f.: F(x)^2, where F(x) is the e.g.f. for A297200. - Max Alekseyev, Jul 12 2019

Crossrefs

Cf. A297196, A297197, A297198, A297200, A297202, A297203, A297204.

Sequence in context: A220028 A006397 A297197 * A003422 A117402 A109455

Adjacent sequences: A297198 A297199 A297200 * A297202 A297203 A297204

Keyword

nonn

Author

N. J. A. Sloane, Jan 10 2018

Extensions

Edited and more terms added by Max Alekseyev, Jul 12 2019

Status

approved