A260153 - cp's OEIS frontend

A260153 Number of walks of length n on the square lattice (with steps N, E, S, W) that start at (0,0) and avoid the West quadrant {(i,j): i < -|j|}.

n	a(n)
0	1
1	3
2	12
3	41
4	164
5	590
6	2360
7	8715
8	34860
9	130776
10	523104
11	1983212
12	7932848
13	30303416
14	121213664
15	465673065
16	1862692260
17	7187760140
18	28751040560
19	111338982436
20	445355929744
21	1729672999418
22	6918691997672
23	26936111629934
24	107744446519736
25	420338301077100

[1, 3, 12, 41, 164, 590, 2360, 8715, 34860, 130776, 523104, 1983212, 7932848, 30303416, 121213664, 465673065, 1862692260, 7187760140, 28751040560, 111338982436, 445355929744, 1729672999418, 6918691997672, 26936111629934, 107744446519736, 420338301077100]

cp's OEIS Frontend

A260153 Number of walks of length n on the square lattice (with steps N, E, S, W) that start at (0,0) and avoid the West quadrant {(i,j): i < -|j|}.

Table of values

List of values