A032349 - cp's OEIS frontend

A032349 Number of paths from (0,0) to (3n,0) that stay in first quadrant (but may touch horizontal axis), where each step is (2,1),(1,2) or (1,-1) and start with (2,1).

n	a(n)
1	1
2	4
3	24
4	172
5	1360
6	11444
7	100520
8	911068
9	8457504
10	80006116
11	768464312
12	7474561164
13	73473471344
14	728745517972
15	7284188537672
16	73301177482172
17	742009157612608
18	7550599410874820
19	77193497566719320
20	792498588659426924

[1, 4, 24, 172, 1360, 11444, 100520, 911068, 8457504, 80006116, 768464312, 7474561164, 73473471344, 728745517972, 7284188537672, 73301177482172, 742009157612608, 7550599410874820, 77193497566719320, 792498588659426924]

cp's OEIS Frontend

A032349 Number of paths from (0,0) to (3n,0) that stay in first quadrant (but may touch horizontal axis), where each step is (2,1),(1,2) or (1,-1) and start with (2,1).

Table of values

List of values