A120986 - cp's OEIS frontend

A120986 Triangle read by rows: T(n,k) is the number of ternary trees with n edges and having k middle edges (n >= 0, k >= 0).

n	a(n)
0	1
1	2
2	1
3	5
4	6
5	1
6	14
7	28
8	12
9	1
10	42
11	120
12	90
13	20
14	1
15	132
16	495
17	550
18	220
19	30
20	1
21	429
22	2002
23	3003
24	1820
25	455
26	42
27	1
28	1430
29	8008
30	15288
31	12740
32	4900
33	840
34	56
35	1
36	4862
37	31824
38	74256
39	79968
40	42840
41	11424
42	1428
43	72
44	1
45	16796
46	125970
47	348840
48	465120
49	325584

[1, 2, 1, 5, 6, 1, 14, 28, 12, 1, 42, 120, 90, 20, 1, 132, 495, 550, 220, 30, 1, 429, 2002, 3003, 1820, 455, 42, 1, 1430, 8008, 15288, 12740, 4900, 840, 56, 1, 4862, 31824, 74256, 79968, 42840, 11424, 1428, 72, 1, 16796, 125970, 348840, 465120, 325584]

cp's OEIS Frontend

A120986 Triangle read by rows: T(n,k) is the number of ternary trees with n edges and having k middle edges (n >= 0, k >= 0).

Table of values

List of values