A121686 - cp's OEIS frontend

A121686 Number of branches in all binary trees with n edges. A binary tree is a rooted tree in which each vertex has at most two children and each child of a vertex is designated as its left or right child.

n	a(n)
1	2
2	6
3	22
4	84
5	324
6	1254
7	4862
8	18876
9	73372
10	285532
11	1112412
12	4338536
13	16938120
14	66192390
15	258909390
16	1013586540
17	3971224620
18	15571021620
19	61096813140
20	239888764440
21	942483155640
22	3705043827420
23	14573172387852
24	57351122857944

[2, 6, 22, 84, 324, 1254, 4862, 18876, 73372, 285532, 1112412, 4338536, 16938120, 66192390, 258909390, 1013586540, 3971224620, 15571021620, 61096813140, 239888764440, 942483155640, 3705043827420, 14573172387852, 57351122857944]

cp's OEIS Frontend

A121686 Number of branches in all binary trees with n edges. A binary tree is a rooted tree in which each vertex has at most two children and each child of a vertex is designated as its left or right child.

Table of values

List of values