A073192 - cp's OEIS frontend

A073192 Number of general plane trees whose n-th subtree from the left is equal to the n-th subtree from the right, for all its subtrees (i.e., are palindromic in the shallow sense).

n	a(n)
0	1
1	1
2	2
3	3
4	8
5	18
6	54
7	155
8	500
9	1614
10	5456
11	18630
12	64960
13	228740
14	814914
15	2926323
16	10589916
17	38561814
18	141219432
19	519711666
20	1921142832
21	7129756188
22	26555149404
23	99228108222
24	371886574632
25	1397548389644
26	5265131346368

[1, 1, 2, 3, 8, 18, 54, 155, 500, 1614, 5456, 18630, 64960, 228740, 814914, 2926323, 10589916, 38561814, 141219432, 519711666, 1921142832, 7129756188, 26555149404, 99228108222, 371886574632, 1397548389644, 5265131346368]

cp's OEIS Frontend

A073192 Number of general plane trees whose n-th subtree from the left is equal to the n-th subtree from the right, for all its subtrees (i.e., are palindromic in the shallow sense).

Table of values

List of values