A191528 - cp's OEIS frontend

A191528 Triangle read by rows: T(n,k) is the number of left factors of Dyck paths of length n that have k returns to the axis.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	3
7	2
8	1
9	6
10	3
11	1
12	10
13	6
14	3
15	1
16	20
17	10
18	4
19	1
20	35
21	20
22	10
23	4
24	1
25	70
26	35
27	15
28	5
29	1
30	126
31	70
32	35
33	15
34	5
35	1
36	252
37	126
38	56
39	21
40	6
41	1
42	462
43	252
44	126
45	56
46	21
47	6
48	1
49	924
50	462
51	210
52	84
53	28
54	7
55	1
56	1716
57	924
58	462
59	210
60	84
61	28
62	7
63	1
64	3432
65	1716
66	792
67	330
68	120
69	36
70	8
71	1
72	6435
73	3432
74	1716
75	792
76	330
77	120
78	36
79	8
80	1

[1, 1, 1, 1, 2, 1, 3, 2, 1, 6, 3, 1, 10, 6, 3, 1, 20, 10, 4, 1, 35, 20, 10, 4, 1, 70, 35, 15, 5, 1, 126, 70, 35, 15, 5, 1, 252, 126, 56, 21, 6, 1, 462, 252, 126, 56, 21, 6, 1, 924, 462, 210, 84, 28, 7, 1, 1716, 924, 462, 210, 84, 28, 7, 1, 3432, 1716, 792, 330, 120, 36, 8, 1, 6435, 3432, 1716, 792, 330, 120, 36, 8, 1]

cp's OEIS Frontend

A191528 Triangle read by rows: T(n,k) is the number of left factors of Dyck paths of length n that have k returns to the axis.

Table of values

List of values