A151335 - cp's OEIS frontend

A151335 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, -1)}.

n	a(n)
0	1
1	0
2	0
3	1
4	0
5	1
6	5
7	1
8	18
9	43
10	47
11	313
12	570
13	1480
14	5847
15	11715
16	41194
17	124918
18	317707
19	1120909
20	3159179
21	9581991
22	31624946
23	92407981
24	300936377
25	954921610
26	2965630143
27	9769316877
28	30986916602
29	100406899586
30	329864837841
31	1066298792633
32	3525879988702
33	11612179660287
34	38300799541992
35	127788972039783

[1, 0, 0, 1, 0, 1, 5, 1, 18, 43, 47, 313, 570, 1480, 5847, 11715, 41194, 124918, 317707, 1120909, 3159179, 9581991, 31624946, 92407981, 300936377, 954921610, 2965630143, 9769316877, 30986916602, 100406899586, 329864837841, 1066298792633, 3525879988702, 11612179660287, 38300799541992, 127788972039783]

cp's OEIS Frontend

A151335 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, -1)}.

Table of values

List of values