OFFSET
4,2
COMMENTS
Number of unoriented linear forests with n nodes and 4 rooted trees.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 4..500
FORMULA
G.f.: (r(x)^4 + r(x^2)^2)/2 where r(x) is the g.f. of A000081.
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Dec 04 2020
STATUS
approved