A380119 - cp's OEIS frontend

A380119 Triangle read by rows: T(n, k) is the number of walks of length 2*n on the N X N grid with unit steps in all four directions (NSWE) starting at (0, 0). k is the common value of the x- and the y-coordinate of the endpoint of the walk.

n	a(n)
0	1
1	2
2	2
3	10
4	16
5	6
6	70
7	140
8	90
9	20
10	588
11	1344
12	1134
13	448
14	70
15	5544
16	13860
17	13860
18	7392
19	2100
20	252
21	56628
22	151008
23	169884
24	109824
25	42900
26	9504
27	924
28	613470
29	1717716
30	2108106
31	1561560
32	750750
33	231660
34	42042
35	3432
36	6952660
37	20225920
38	26546520
39	21781760
40	12155000
41	4667520
42	1191190
43	183040
44	12870

[1, 2, 2, 10, 16, 6, 70, 140, 90, 20, 588, 1344, 1134, 448, 70, 5544, 13860, 13860, 7392, 2100, 252, 56628, 151008, 169884, 109824, 42900, 9504, 924, 613470, 1717716, 2108106, 1561560, 750750, 231660, 42042, 3432, 6952660, 20225920, 26546520, 21781760, 12155000, 4667520, 1191190, 183040, 12870]

cp's OEIS Frontend

A380119 Triangle read by rows: T(n, k) is the number of walks of length 2*n on the N X N grid with unit steps in all four directions (NSWE) starting at (0, 0). k is the common value of the x- and the y-coordinate of the endpoint of the walk.

Table of values

List of values