OFFSET
0,5
COMMENTS
First differs from A000055 at a(10).
First differs from A130131 at a(10), n >= 1.
The ratio of consecutive terms seems to tend to some limit. - Andrey Zabolotskiy, Dec 12 2016
LINKS
Andrey Zabolotskiy, Python script for the sequence
EXAMPLE
From Andrey Zabolotskiy, Nov 21 2016: (Start)
Three trees that are counted in A000055(10) but not in a(10):
(1)
o o-o-o
| |
o----o
| |
o o-o-o
(2)
o-o-o
|
o-o-o-o
|
o-o-o
(3)
o-o-o-o-o-o-o
|
o-o-o
(End)
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Gabriel Burns, Oct 31 2016
EXTENSIONS
Corrections and more terms from Andrey Zabolotskiy, Nov 21 2016
STATUS
approved