A108425 - cp's OEIS frontend

A108425 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 (i.e., ud and Ud's).

n	a(n)
1	2
2	4
3	6
4	8
5	36
6	22
7	16
8	144
9	248
10	90
11	32
12	480
13	1600
14	1560
15	394
16	64
17	1440
18	7840
19	14400
20	9420
21	1806
22	128
23	4032
24	32480
25	95760
26	115416
27	55692
28	8558
29	256
30	10752
31	120064
32	517440
33	986272
34	860832
35	325360
36	41586
37	512
38	27648
39	408576
40	2419200
41	6668928

[2, 4, 6, 8, 36, 22, 16, 144, 248, 90, 32, 480, 1600, 1560, 394, 64, 1440, 7840, 14400, 9420, 1806, 128, 4032, 32480, 95760, 115416, 55692, 8558, 256, 10752, 120064, 517440, 986272, 860832, 325360, 41586, 512, 27648, 408576, 2419200, 6668928]

cp's OEIS Frontend

A108425 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 (i.e., ud and Ud's).

Table of values

List of values