A108448 - cp's OEIS frontend

A108448 Number of peaks of the form ud in all paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1).

n	a(n)
1	1
2	7
3	61
4	575
5	5641
6	56695
7	579125
8	5984767
9	62390545
10	654862247
11	6911195501
12	73265596607
13	779594526361
14	8321683861015
15	89070157349221
16	955598531432447
17	10273391096237089
18	110647714508386375
19	1193641560393864605

[1, 7, 61, 575, 5641, 56695, 579125, 5984767, 62390545, 654862247, 6911195501, 73265596607, 779594526361, 8321683861015, 89070157349221, 955598531432447, 10273391096237089, 110647714508386375, 1193641560393864605]

cp's OEIS Frontend

A108448 Number of peaks of the form ud in all paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1).

Table of values

List of values