A151403 - cp's OEIS frontend

A151403 Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2*n steps taken from {(-1, 0), (-1, 1), (1, 0), (1, 1)}.

n	a(n)
0	1
1	4
2	32
3	320
4	3584
5	43008
6	540672
7	7028736
8	93716480
9	1274544128
10	17611882496
11	246566354944
12	3489862254592
13	49855175065600
14	717914520944640
15	10409760553697280
16	151860036312760320
17	2227280532587151360
18	32823081532863283200
19	485781606686376591360
20	7217326727911880785920

[1, 4, 32, 320, 3584, 43008, 540672, 7028736, 93716480, 1274544128, 17611882496, 246566354944, 3489862254592, 49855175065600, 717914520944640, 10409760553697280, 151860036312760320, 2227280532587151360, 32823081532863283200, 485781606686376591360, 7217326727911880785920]

cp's OEIS Frontend

A151403 Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of 2*n steps taken from {(-1, 0), (-1, 1), (1, 0), (1, 1)}.

Table of values

List of values