A102892 - cp's OEIS frontend

A102892 Triangle read by rows: T(n,k) is the number of noncrossing trees with n edges in which the number of edges from the root to the first branch point is k.

n	a(n)
0	1
1	0
2	1
3	1
4	0
5	2
6	5
7	3
8	0
9	4
10	25
11	16
12	6
13	0
14	8
15	130
16	83
17	32
18	12
19	0
20	16
21	700
22	442
23	166
24	64
25	24
26	0
27	32
28	3876
29	2420
30	884
31	332
32	128
33	48
34	0
35	64
36	21945
37	13566
38	4840
39	1768
40	664
41	256
42	96
43	0
44	128
45	126500
46	77539
47	27132
48	9680
49	3536
50	1328
51	512
52	192
53	0
54	256

[1, 0, 1, 1, 0, 2, 5, 3, 0, 4, 25, 16, 6, 0, 8, 130, 83, 32, 12, 0, 16, 700, 442, 166, 64, 24, 0, 32, 3876, 2420, 884, 332, 128, 48, 0, 64, 21945, 13566, 4840, 1768, 664, 256, 96, 0, 128, 126500, 77539, 27132, 9680, 3536, 1328, 512, 192, 0, 256]

cp's OEIS Frontend

A102892 Triangle read by rows: T(n,k) is the number of noncrossing trees with n edges in which the number of edges from the root to the first branch point is k.

Table of values

List of values