A108446 - cp's OEIS frontend

A108446 Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and have k peaks of the form ud.

n	a(n)
0	1
1	1
2	1
3	4
4	5
5	1
6	20
7	32
8	13
9	1
10	113
11	223
12	135
13	26
14	1
15	688
16	1620
17	1300
18	412
19	45
20	1
21	4404
22	12064
23	12050
24	5350
25	1030
26	71
27	1
28	29219
29	91335
30	109134
31	62450
32	17575
33	2247
34	105
35	1
36	199140
37	699689
38	973077
39	682234
40	254625
41	49210
42	4438
43	148
44	1
45	1385904
46	5407744

[1, 1, 1, 4, 5, 1, 20, 32, 13, 1, 113, 223, 135, 26, 1, 688, 1620, 1300, 412, 45, 1, 4404, 12064, 12050, 5350, 1030, 71, 1, 29219, 91335, 109134, 62450, 17575, 2247, 105, 1, 199140, 699689, 973077, 682234, 254625, 49210, 4438, 148, 1, 1385904, 5407744]

cp's OEIS Frontend

A108446 Triangle read by rows: T(n,k) is number of paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) and have k peaks of the form ud.

Table of values

List of values