0,5
First differs from A000055 at a(10).
First differs from A130131 at a(12), n >= 1.
Table of n, a(n) for n=0..12.
a(10) = 105 counts all trees except for the following.
o o
\ /
o

/ \
/ \ / \
o o o o
Cf. A000055, A130131, A277795.
Sequence in context: A198655 A211694 A130131 * A123465 A000055 A217312
Adjacent sequences: A277793 A277794 A277795 * A277797 A277798 A277799
nonn,more
Gabriel Burns, Oct 31 2016
approved