A297197 Related to label-increasing forests with branching bounded by 3.

1, 2, 4, 10, 34, 146, 752, 4520, 31062, 240188, 2063846, 19508770, 201184666, 2247704104, 27044622168, 348654862510, 4794539357488, 70054014476102, 1083796147054274, 17698938549553490, 304247125951777284

Offset

0,2

Comments

Sequence B_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 A297196. - Max Alekseyev, Jul 12 2019

Crossrefs

Cf. A297196, A297198, A297200, A297201, A297202, A297203, A297204.

Sequence in context: A327424 A220028 A006397 * A297201 A003422 A117402

Adjacent sequences: A297194 A297195 A297196 * A297198 A297199 A297200

Keyword

nonn

Author

N. J. A. Sloane, Jan 10 2018

Extensions

Edited and extended by Max Alekseyev, Jul 12 2019

Status

approved