WOLFRAM
|
DEMONSTRATIONS PROJECT
Catalan Number Trees
n
2
3
4
5
6
7
t
r
e
e
1
O
n
e
o
f
t
h
e
m
a
n
y
i
n
t
e
r
p
r
e
t
a
t
i
o
n
s
o
f
t
h
e
C
a
t
a
l
a
n
n
u
m
b
e
r
s
C
n
i
s
t
h
e
n
u
m
b
e
r
o
f
p
l
a
n
a
r
b
i
n
a
r
y
t
r
e
e
s
w
i
t
h
n
+
1
l
e
a
v
e
s
.