A120981 - cp's OEIS frontend

A120981 Triangle read by rows: T(n,k) is the number of ternary trees with n edges and having k vertices of outdegree 1 (n >= 0, k >= 0).

n	a(n)
0	1
1	0
2	3
3	3
4	0
5	9
6	1
7	27
8	0
9	27
10	18
11	12
12	162
13	0
14	81
15	15
16	270
17	90
18	810
19	0
20	243
21	138
22	270
23	2430
24	540
25	3645
26	0
27	729
28	189
29	2898
30	2835
31	17010
32	2835
33	15309
34	0
35	2187
36	1218
37	4536
38	34776
39	22680
40	102060
41	13608
42	61236
43	0
44	6561
45	2280
46	32886
47	61236
48	312984
49	153090
50	551124

[1, 0, 3, 3, 0, 9, 1, 27, 0, 27, 18, 12, 162, 0, 81, 15, 270, 90, 810, 0, 243, 138, 270, 2430, 540, 3645, 0, 729, 189, 2898, 2835, 17010, 2835, 15309, 0, 2187, 1218, 4536, 34776, 22680, 102060, 13608, 61236, 0, 6561, 2280, 32886, 61236, 312984, 153090, 551124]

cp's OEIS Frontend

A120981 Triangle read by rows: T(n,k) is the number of ternary trees with n edges and having k vertices of outdegree 1 (n >= 0, k >= 0).

Table of values

List of values