A108436 - cp's OEIS frontend

A108436 Number of returns to the x-axis 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	2
2	14
3	106
4	862
5	7378
6	65550
7	599002
8	5594942
9	53181730
10	512784142
11	5003410762
12	49312114334
13	490192537586
14	4909102791694
15	49482525122490
16	501626536004734
17	5111038278845506
18	52312236295906830
19	537605889306476074

[2, 14, 106, 862, 7378, 65550, 599002, 5594942, 53181730, 512784142, 5003410762, 49312114334, 490192537586, 4909102791694, 49482525122490, 501626536004734, 5111038278845506, 52312236295906830, 537605889306476074]

cp's OEIS Frontend

A108436 Number of returns to the x-axis 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