A328280 - cp's OEIS frontend

A328280 Number of n-step walks on cubic lattice starting at (0,0,0), ending at (0,floor(n/2),ceiling(n/2)), remaining in the first (nonnegative) octant and using steps (0,0,1), (0,1,0), (1,0,0), (-1,1,1), (1,-1,1), and (1,1,-1).

n	a(n)
0	1
1	1
2	3
3	7
4	26
5	82
6	343
7	1257
8	5594
9	22411
10	103730
11	440350
12	2094028
13	9255877
14	44889351
15	204385719
16	1006126370
17	4685719954
18	23337166962
19	110633755459
20	556199376622
21	2674751727209
22	13550764116530
23	65935784179142
24	336190200180652
25	1651985253047884

[1, 1, 3, 7, 26, 82, 343, 1257, 5594, 22411, 103730, 440350, 2094028, 9255877, 44889351, 204385719, 1006126370, 4685719954, 23337166962, 110633755459, 556199376622, 2674751727209, 13550764116530, 65935784179142, 336190200180652, 1651985253047884]

cp's OEIS Frontend

A328280 Number of n-step walks on cubic lattice starting at (0,0,0), ending at (0,floor(n/2),ceiling(n/2)), remaining in the first (nonnegative) octant and using steps (0,0,1), (0,1,0), (1,0,0), (-1,1,1), (1,-1,1), and (1,1,-1).

Table of values

List of values