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A297198
Related to label-increasing forests with branching bounded by 3.
7
1, 3, 9, 30, 120, 579, 3282, 21375, 157365, 1292667, 11722416, 116327220, 1253939835, 14590810566, 182283001623, 2433550353915, 34576093637625, 520923897031368, 8295262714384764, 139214574513959445
OFFSET
0,2
COMMENTS
Sequence B_n(3) in Riordan 1978 or 1979.
LINKS
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
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 10 2018
EXTENSIONS
Edited and extended by Max Alekseyev, Jul 12 2019
STATUS
approved