A297198 - OEIS

A297198

Related to label-increasing forests with branching bounded by 3.

1, 3, 9, 30, 120, 579, 3282, 21375, 157365, 1292667, 11722416, 116327220, 1253939835, 14590810566, 182283001623, 2433550353915, 34576093637625, 520923897031368, 8295262714384764, 139214574513959445

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

OFFSET

0,2

COMMENTS

Sequence B_n(3) in Riordan 1978 or 1979.

LINKS

Table of n, a(n) for n=0..19.

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)^3, where F(x) is the e.g.f. for A297196. - Max Alekseyev, Jul 12 2019

CROSSREFS

Cf. A297196, A297197, A297200, A297201, A297202, A297203, A297204.

Sequence in context: A279199 A352280 A292758 * A297202 A370439 A003604

Adjacent sequences: A297195 A297196 A297197 * A297199 A297200 A297201

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jan 10 2018

EXTENSIONS

Edited and extended by Max Alekseyev, Jul 12 2019

STATUS

approved