A127618 - cp's OEIS frontend

A127618 Number of walks from (0,0) to (n,n) in the region 0 <= x-y <= 4 with the steps (1,0), (0, 1), (2,0) and (0,2).

n	a(n)
0	1
1	1
2	5
3	22
4	117
5	590
6	3018
7	15378
8	78440
9	399992
10	2039852
11	10402480
12	53049048
13	270531368
14	1379614800
15	7035549312
16	35878823312
17	182969359520
18	933079279328
19	4758375627808
20	24266039468160
21	123748253080832
22	631072497876672

[1, 1, 5, 22, 117, 590, 3018, 15378, 78440, 399992, 2039852, 10402480, 53049048, 270531368, 1379614800, 7035549312, 35878823312, 182969359520, 933079279328, 4758375627808, 24266039468160, 123748253080832, 631072497876672]

cp's OEIS Frontend

A127618 Number of walks from (0,0) to (n,n) in the region 0 <= x-y <= 4 with the steps (1,0), (0, 1), (2,0) and (0,2).

Table of values

List of values