A143955 - cp's OEIS frontend

A143955 Sum of the altitudes of the leftmost valleys of all Dyck paths of semilength n (if path has no valley, then this altitude is taken to be 0).

n	a(n)
0	0
1	0
2	0
3	1
4	6
5	26
6	101
7	376
8	1377
9	5017
10	18277
11	66727
12	244377
13	898129
14	3312554
15	12260129
16	45526754
17	169588754
18	633580634
19	2373550184
20	8914719134
21	33562602134
22	126640791884
23	478848661898
24	1814142235028
25	6885560250148

[0, 0, 0, 1, 6, 26, 101, 376, 1377, 5017, 18277, 66727, 244377, 898129, 3312554, 12260129, 45526754, 169588754, 633580634, 2373550184, 8914719134, 33562602134, 126640791884, 478848661898, 1814142235028, 6885560250148]

cp's OEIS Frontend

A143955 Sum of the altitudes of the leftmost valleys of all Dyck paths of semilength n (if path has no valley, then this altitude is taken to be 0).

Table of values

List of values