A219226 - cp's OEIS frontend

A219226 Number of rooted unlabeled ordered (plane) trees with 2n leaves such that i) every internal node has an even number of children and ii) every path from the root to a leaf is the same length.

n	a(n)
0	0
1	1
2	2
3	3
4	6
5	13
6	29
7	65
8	147
9	337
10	785
11	1857
12	4452
13	10789
14	26365
15	64833
16	160167
17	397025
18	986593
19	2456193
20	6123726
21	15286021
22	38198573
23	95555937
24	239294222
25	599914489
26	1505750425
27	3783967201
28	9521244242
29	23988787485
30	60520345765
31	152889244033
32	386752047956

[0, 1, 2, 3, 6, 13, 29, 65, 147, 337, 785, 1857, 4452, 10789, 26365, 64833, 160167, 397025, 986593, 2456193, 6123726, 15286021, 38198573, 95555937, 239294222, 599914489, 1505750425, 3783967201, 9521244242, 23988787485, 60520345765, 152889244033, 386752047956]

cp's OEIS Frontend

A219226 Number of rooted unlabeled ordered (plane) trees with 2n leaves such that i) every internal node has an even number of children and ii) every path from the root to a leaf is the same length.

Table of values

List of values