A151345 - cp's OEIS frontend

A151345 Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (-1, 1), (1, -1), (1, 1)}.

n	a(n)
0	1
1	1
2	6
3	55
4	644
5	8694
6	128964
7	2045901
8	34136960
9	592493044
10	10614366568
11	195164993478
12	3667395504304
13	70199379387700
14	1365217425954360
15	26918993235702735
16	537238205832405960
17	10837199420262489120
18	220699085927921277600
19	4533022083670853217060
20	93823829712145743930720

[1, 1, 6, 55, 644, 8694, 128964, 2045901, 34136960, 592493044, 10614366568, 195164993478, 3667395504304, 70199379387700, 1365217425954360, 26918993235702735, 537238205832405960, 10837199420262489120, 220699085927921277600, 4533022083670853217060, 93823829712145743930720]

cp's OEIS Frontend

A151345 Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (-1, 1), (1, -1), (1, 1)}.

Table of values

List of values