A151404 - cp's OEIS frontend

A151404 Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, -1)}.

n	a(n)
0	1
1	1
2	2
3	4
4	9
5	23
6	58
7	160
8	447
9	1280
10	3799
11	11329
12	34648
13	107194
14	335052
15	1062809
16	3392928
17	10944072
18	35576811
19	116369798
20	383517144
21	1270497711
22	4232708951
23	14174190320
24	47670133454
25	161055621043
26	546226400383
27	1859448826545
28	6352403850949
29	21770237036258
30	74841611960045
31	258025290079584
32	891972398224757

[1, 1, 2, 4, 9, 23, 58, 160, 447, 1280, 3799, 11329, 34648, 107194, 335052, 1062809, 3392928, 10944072, 35576811, 116369798, 383517144, 1270497711, 4232708951, 14174190320, 47670133454, 161055621043, 546226400383, 1859448826545, 6352403850949, 21770237036258, 74841611960045, 258025290079584, 891972398224757]

cp's OEIS Frontend

A151404 Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, 0), (0, -1), (0, 1), (1, -1)}.

Table of values

List of values