OFFSET
1,2
LINKS
Ricardo Gómez Aíza, Trees with flowers: A catalog of integer partition and integer composition trees with their asymptotic analysis, arXiv:2402.16111 [math.CO], 2024. See p. 21.
FORMULA
G.f.: z(1-z)M^3, with M the g.f. of the Motzkin numbers (A001006).
CROSSREFS
KEYWORD
nonn
AUTHOR
EXTENSIONS
a(25) corrected and more terms from Sean A. Irvine, Sep 17 2019
STATUS
approved