A107708 - cp's OEIS frontend

A107708 Number of paths from (0,0) to (3n,0) that stay in the first quadrant (x,y >= 0) and where each step is (3,0), (2,1), (1,2), or (1,-1).

n	a(n)
0	1
1	3
2	18
3	144
4	1323
5	13176
6	138348
7	1507977
8	16900650
9	193536864
10	2254630788
11	26635735440
12	318350663748
13	3842488208997
14	46770206742342
15	573435609537600
16	7075551692662875
17	87794803094586336
18	1094807464312435344

[1, 3, 18, 144, 1323, 13176, 138348, 1507977, 16900650, 193536864, 2254630788, 26635735440, 318350663748, 3842488208997, 46770206742342, 573435609537600, 7075551692662875, 87794803094586336, 1094807464312435344]

cp's OEIS Frontend

A107708 Number of paths from (0,0) to (3n,0) that stay in the first quadrant (x,y >= 0) and where each step is (3,0), (2,1), (1,2), or (1,-1).

Table of values

List of values