A275431 - cp's OEIS frontend

A275431 Triangle read by rows: T(n,k) = number of ways to insert n pairs of parentheses in k words.

n	a(n)
1	1
2	2
3	1
4	5
5	2
6	1
7	14
8	8
9	2
10	1
11	42
12	24
13	8
14	2
15	1
16	132
17	85
18	28
19	8
20	2
21	1
22	429
23	286
24	100
25	28
26	8
27	2
28	1
29	1430
30	1008
31	358
32	105
33	28
34	8
35	2
36	1
37	4862
38	3536
39	1309
40	378
41	105
42	28
43	8
44	2
45	1
46	16796
47	12618
48	4772
49	1410
50	384
51	105
52	28
53	8
54	2
55	1
56	58786
57	45220
58	17556
59	5220
60	1435
61	384
62	105
63	28
64	8
65	2
66	1

[1, 2, 1, 5, 2, 1, 14, 8, 2, 1, 42, 24, 8, 2, 1, 132, 85, 28, 8, 2, 1, 429, 286, 100, 28, 8, 2, 1, 1430, 1008, 358, 105, 28, 8, 2, 1, 4862, 3536, 1309, 378, 105, 28, 8, 2, 1, 16796, 12618, 4772, 1410, 384, 105, 28, 8, 2, 1, 58786, 45220, 17556, 5220, 1435, 384, 105, 28, 8, 2, 1]

cp's OEIS Frontend

A275431 Triangle read by rows: T(n,k) = number of ways to insert n pairs of parentheses in k words.

Table of values

List of values