A151346 - cp's OEIS frontend

A151346 Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of n steps taken from {(-1, 0), (-1, 1), (0, -1), (1, 0)}.

n	a(n)
0	1
1	0
2	1
3	1
4	2
5	7
6	10
7	38
8	89
9	229
10	752
11	1873
12	6009
13	17746
14	51970
15	168199
16	503489
17	1609327
18	5131184
19	16183314
20	53017947
21	170708648
22	559207257
23	1846295302
24	6075728984
25	20284263554
26	67649481468
27	226890912838
28	765669449228
29	2585600921015
30	8785174853897
31	29918390234278
32	102190450691351
33	350429638975797

[1, 0, 1, 1, 2, 7, 10, 38, 89, 229, 752, 1873, 6009, 17746, 51970, 168199, 503489, 1609327, 5131184, 16183314, 53017947, 170708648, 559207257, 1846295302, 6075728984, 20284263554, 67649481468, 226890912838, 765669449228, 2585600921015, 8785174853897, 29918390234278, 102190450691351, 350429638975797]

cp's OEIS Frontend

A151346 Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of n steps taken from {(-1, 0), (-1, 1), (0, -1), (1, 0)}.

Table of values

List of values