A297201 - OEIS

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

(list; graph; refs; listen; history; text; internal format)

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