A316727 - cp's OEIS frontend

A316727 Number of permutations of {0,1,...,2n} with first element n whose sequence of ascents and descents forms a Dyck path.

n	a(n)
0	1
1	1
2	5
3	87
4	3337
5	223333
6	23068057
7	3403720071
8	679894572497
9	176710079709345
10	57967294285022281
11	23427042148948682599
12	11437832700333350250001
13	6637473822604173137681381
14	4515971399162518697397538173
15	3560540787622773257563653593551

[1, 1, 5, 87, 3337, 223333, 23068057, 3403720071, 679894572497, 176710079709345, 57967294285022281, 23427042148948682599, 11437832700333350250001, 6637473822604173137681381, 4515971399162518697397538173, 3560540787622773257563653593551]

cp's OEIS Frontend

A316727 Number of permutations of {0,1,...,2n} with first element n whose sequence of ascents and descents forms a Dyck path.

Table of values

List of values