A100400 - cp's OEIS frontend

A100400 Triangle read by rows: T(n,k) is the number of nonroot nodes of outdegree k (0<=k<=n-1) in all non-crossing trees with n edges.

n	a(n)
1	1
2	4
3	2
4	21
5	12
6	3
7	120
8	72
9	24
10	4
11	715
12	440
13	165
14	40
15	5
16	4368
17	2730
18	1092
19	312
20	60
21	6
22	27132
23	17136
24	7140
25	2240
26	525
27	84
28	7
29	170544
30	108528
31	46512
32	15504
33	4080
34	816
35	112
36	8
37	1081575
38	692208
39	302841
40	105336
41	29925
42	6840
43	1197
44	144
45	9
46	6906900
47	4440150
48	1973400
49	708400
50	212520
51	53130
52	10780
53	1680
54	180
55	10

[1, 4, 2, 21, 12, 3, 120, 72, 24, 4, 715, 440, 165, 40, 5, 4368, 2730, 1092, 312, 60, 6, 27132, 17136, 7140, 2240, 525, 84, 7, 170544, 108528, 46512, 15504, 4080, 816, 112, 8, 1081575, 692208, 302841, 105336, 29925, 6840, 1197, 144, 9, 6906900, 4440150, 1973400, 708400, 212520, 53130, 10780, 1680, 180, 10]

cp's OEIS Frontend

A100400 Triangle read by rows: T(n,k) is the number of nonroot nodes of outdegree k (0<=k<=n-1) in all non-crossing trees with n edges.

Table of values

List of values