A191526 - cp's OEIS frontend

A191526 Number left factors of Dyck paths of length n and having no hills; a hill is a (1,1)-step starting at level 0 and followed by a (1,-1)-step.

n	a(n)
0	1
1	1
2	1
3	2
4	4
5	7
6	13
7	24
8	46
9	86
10	166
11	314
12	610
13	1163
14	2269
15	4352
16	8518
17	16414
18	32206
19	62292
20	122464
21	237590
22	467842
23	909960
24	1794196
25	3497248
26	6903352
27	13480826
28	26635774
29	52097267
30	103020253
31	201780224
32	399300166
33	783051638
34	1550554582
35	3044061116

[1, 1, 1, 2, 4, 7, 13, 24, 46, 86, 166, 314, 610, 1163, 2269, 4352, 8518, 16414, 32206, 62292, 122464, 237590, 467842, 909960, 1794196, 3497248, 6903352, 13480826, 26635774, 52097267, 103020253, 201780224, 399300166, 783051638, 1550554582, 3044061116]

cp's OEIS Frontend

A191526 Number left factors of Dyck paths of length n and having no hills; a hill is a (1,1)-step starting at level 0 and followed by a (1,-1)-step.

Table of values

List of values