A089383 - cp's OEIS frontend

A089383 Number of peaks at even level in all Schroeder paths (i.e., consisting of steps U=(1,1), D=(1,-1), H=(2,0) and never going below the axis) from (0,0) to (2n+4,0).

n	a(n)
0	1
1	8
2	49
3	280
4	1569
5	8752
6	48833
7	272976
8	1529441
9	8589176
10	48342449
11	272640680
12	1540495553
13	8718956768
14	49423735553
15	280551815456
16	1594568513857
17	9073566717800
18	51686272315569
19	294711466792120
20	1681938025818081
21	9606920311565328
22	54915241962566849
23	314131983462253680

[1, 8, 49, 280, 1569, 8752, 48833, 272976, 1529441, 8589176, 48342449, 272640680, 1540495553, 8718956768, 49423735553, 280551815456, 1594568513857, 9073566717800, 51686272315569, 294711466792120, 1681938025818081, 9606920311565328, 54915241962566849, 314131983462253680]

cp's OEIS Frontend

A089383 Number of peaks at even level in all Schroeder paths (i.e., consisting of steps U=(1,1), D=(1,-1), H=(2,0) and never going below the axis) from (0,0) to (2n+4,0).

Table of values

List of values