A277248 - cp's OEIS frontend

A277248 Number of planar walks starting at (1,1), ending at (3n,0), remaining in the first quadrant and using steps (-1,2) and (2,-1).

n	a(n)
1	1
2	2
3	6
4	24
5	108
6	528
7	2724
8	14616
9	80760
10	456552
11	2628504
12	15360216
13	90879096
14	543336912
15	3277586136
16	19924733088
17	121943223576
18	750756116376
19	4646484480552
20	28892787031008
21	180420486241776
22	1130930538186360
23	7113550964713848
24	44885329202906448

[1, 2, 6, 24, 108, 528, 2724, 14616, 80760, 456552, 2628504, 15360216, 90879096, 543336912, 3277586136, 19924733088, 121943223576, 750756116376, 4646484480552, 28892787031008, 180420486241776, 1130930538186360, 7113550964713848, 44885329202906448]

cp's OEIS Frontend

A277248 Number of planar walks starting at (1,1), ending at (3n,0), remaining in the first quadrant and using steps (-1,2) and (2,-1).

Table of values

List of values