A380120 - cp's OEIS frontend

A380120 Triangle read by rows: T(n, k) is the number of walks of length n on the Z X Z grid with unit steps in all four directions (NSWE) starting at (0, 0). k is the absolute value of the x-coordinate of the endpoint of the walk.

n	a(n)
0	1
1	2
2	2
3	6
4	8
5	2
6	20
7	30
8	12
9	2
10	70
11	112
12	56
13	16
14	2
15	252
16	420
17	240
18	90
19	20
20	2
21	924
22	1584
23	990
24	440
25	132
26	24
27	2
28	3432
29	6006
30	4004
31	2002
32	728
33	182
34	28
35	2
36	12870
37	22880
38	16016
39	8736
40	3640
41	1120
42	240
43	32
44	2
45	48620
46	87516
47	63648
48	37128
49	17136
50	6120
51	1632
52	306
53	36
54	2

[1, 2, 2, 6, 8, 2, 20, 30, 12, 2, 70, 112, 56, 16, 2, 252, 420, 240, 90, 20, 2, 924, 1584, 990, 440, 132, 24, 2, 3432, 6006, 4004, 2002, 728, 182, 28, 2, 12870, 22880, 16016, 8736, 3640, 1120, 240, 32, 2, 48620, 87516, 63648, 37128, 17136, 6120, 1632, 306, 36, 2]

cp's OEIS Frontend

A380120 Triangle read by rows: T(n, k) is the number of walks of length n on the Z X Z grid with unit steps in all four directions (NSWE) starting at (0, 0). k is the absolute value of the x-coordinate of the endpoint of the walk.

Table of values

List of values