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A297203
Related to label-increasing forests with branching bounded by 4.
7
1, 4, 16, 68, 324, 1776, 11204, 80512, 651076, 5859204, 58117016, 630181168, 7417888504, 94216151156, 1284469275324, 18710413293092, 290033953850736, 4767191101639844, 82819769006424276, 1516403268298151208
OFFSET
0,2
COMMENTS
Sequence C_n(4) 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)^2, where F(x) is the e.g.f. for A297200. - Max Alekseyev, Jul 12 2019
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 10 2018
EXTENSIONS
Edited and more terms added by Max Alekseyev, Jul 12 2019
STATUS
approved