A277920 - cp's OEIS frontend

A277920 Number of positive walks with n steps {-4,-3,-2,-1,0,1,2,3,4} starting at the origin, ending at altitude 1, and staying strictly above the x-axis.

n	a(n)
0	0
1	1
2	4
3	20
4	120
5	780
6	5382
7	38638
8	285762
9	2162033
10	16655167
11	130193037
12	1030117023
13	8234025705
14	66391916397
15	539360587341
16	4410492096741
17	36274113675369
18	299864297741292
19	2490192142719336
20	20764402240048267
21	173784940354460219
22	1459360304511145146

[0, 1, 4, 20, 120, 780, 5382, 38638, 285762, 2162033, 16655167, 130193037, 1030117023, 8234025705, 66391916397, 539360587341, 4410492096741, 36274113675369, 299864297741292, 2490192142719336, 20764402240048267, 173784940354460219, 1459360304511145146]

cp's OEIS Frontend

A277920 Number of positive walks with n steps {-4,-3,-2,-1,0,1,2,3,4} starting at the origin, ending at altitude 1, and staying strictly above the x-axis.

Table of values

List of values