A003239 - cp's OEIS frontend

A003239 Number of rooted planar trees with n non-root nodes: circularly cycling the subtrees at the root gives equivalent trees.

n	a(n)
0	1
1	1
2	2
3	4
4	10
5	26
6	80
7	246
8	810
9	2704
10	9252
11	32066
12	112720
13	400024
14	1432860
15	5170604
16	18784170
17	68635478
18	252088496
19	930138522
20	3446167860
21	12815663844
22	47820447028
23	178987624514
24	671825133648
25	2528212128776
26	9536895064400
27	36054433810102
28	136583761444364
29	518401146543812

[1, 1, 2, 4, 10, 26, 80, 246, 810, 2704, 9252, 32066, 112720, 400024, 1432860, 5170604, 18784170, 68635478, 252088496, 930138522, 3446167860, 12815663844, 47820447028, 178987624514, 671825133648, 2528212128776, 9536895064400, 36054433810102, 136583761444364, 518401146543812]

cp's OEIS Frontend

A003239 Number of rooted planar trees with n non-root nodes: circularly cycling the subtrees at the root gives equivalent trees.

Table of values

List of values