A073190 - cp's OEIS frontend

A073190 Number of general plane trees which are either empty (the case a(0)), or whose root degree is either 1 (i.e., the planted trees) or the two leftmost subtrees (of the root node) are identical.

n	a(n)
0	1
1	1
2	2
3	3
4	8
5	20
6	60
7	181
8	584
9	1916
10	6476
11	22210
12	77416
13	272840
14	971640
15	3488925
16	12621168
17	45946156
18	168206604
19	618853270
20	2286974856
21	8485246456
22	31596023208
23	118037654258
24	442287721872
25	1661790513944
26	6259494791096

[1, 1, 2, 3, 8, 20, 60, 181, 584, 1916, 6476, 22210, 77416, 272840, 971640, 3488925, 12621168, 45946156, 168206604, 618853270, 2286974856, 8485246456, 31596023208, 118037654258, 442287721872, 1661790513944, 6259494791096]

cp's OEIS Frontend

A073190 Number of general plane trees which are either empty (the case a(0)), or whose root degree is either 1 (i.e., the planted trees) or the two leftmost subtrees (of the root node) are identical.

Table of values

List of values