OFFSET
1,3
COMMENTS
In a transitive rooted tree, every branch of a branch of the root is also a branch of the root.
EXAMPLE
Inequivalent representatives of the a(5) = 13 leaf-colorings:
(1111) (1(11)) (11(1))
(1112) (1(12)) (11(2))
(1122) (1(22)) (12(1))
(1123) (1(23)) (12(3))
(1234)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Gus Wiseman, Aug 21 2018
STATUS
approved