A108430 - cp's OEIS frontend

A108430 Number of d steps 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	3
2	31
3	311
4	3151
5	32299
6	334335
7	3488239
8	36627487
9	386618387
10	4098713631
11	43611791783
12	465496885231
13	4981942135611
14	53443871159551
15	574500093677535
16	6186886528903231
17	66735614131858723
18	720897596248427295

[3, 31, 311, 3151, 32299, 334335, 3488239, 36627487, 386618387, 4098713631, 43611791783, 465496885231, 4981942135611, 53443871159551, 574500093677535, 6186886528903231, 66735614131858723, 720897596248427295]

cp's OEIS Frontend

A108430 Number of d steps 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