A122951 - cp's OEIS frontend

A122951 Number of walks from (0,0) to (n,n) in the region x >= y 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	654
6	3843
7	23323
8	145172
9	921508
10	5942737
11	38825546
12	256431172
13	1709356836
14	11485249995
15	77703736926
16	528893901963
17	3619228605738
18	24884558358426
19	171828674445330
20	1191050708958096
21	8284698825305832

[1, 1, 5, 22, 117, 654, 3843, 23323, 145172, 921508, 5942737, 38825546, 256431172, 1709356836, 11485249995, 77703736926, 528893901963, 3619228605738, 24884558358426, 171828674445330, 1191050708958096, 8284698825305832]

cp's OEIS Frontend

A122951 Number of walks from (0,0) to (n,n) in the region x >= y with the steps (1,0), (0,1), (2,0) and (0,2).

Table of values

List of values