OFFSET
2,2
COMMENTS
Mixed trees are trees where a subset of the edges are directed (edges called arcs then). This is the first subdiagonal of A335362: n nodes implies trees with n-1 edges. If exactly one of these edges is not directed and the remaining n-2 edges are directed, the trees are counted here.
CROSSREFS
KEYWORD
nonn
AUTHOR
R. J. Mathar, Jun 15 2020
STATUS
approved