A199915 - cp's OEIS frontend

A199915 Triangle read by rows: T(n,k) is the number of n-step paths from (0,0) to (0,k) that stay in the first quadrant (but may touch the axes) consisting of steps (1,0), (0,1), (0,-1) and (-1,1).

n	a(n)
0	1
1	0
2	1
3	1
4	1
5	1
6	1
7	2
8	3
9	1
10	2
11	7
12	5
13	6
14	1
15	7
16	10
17	21
18	14
19	10
20	1
21	10
22	38
23	48
24	51
25	35
26	15
27	1
28	38
29	89
30	135
31	168
32	120
33	76
34	21
35	1
36	89
37	229
38	441
39	458
40	474
41	281
42	147
43	28
44	1
45	229
46	752
47	1121
48	1604
49	1475
50	1188
51	637
52	260
53	36
54	1
55	752
56	1873
57	3692
58	4772
59	5100
60	4329
61	2800
62	1366
63	429
64	45
65	1

[1, 0, 1, 1, 1, 1, 1, 2, 3, 1, 2, 7, 5, 6, 1, 7, 10, 21, 14, 10, 1, 10, 38, 48, 51, 35, 15, 1, 38, 89, 135, 168, 120, 76, 21, 1, 89, 229, 441, 458, 474, 281, 147, 28, 1, 229, 752, 1121, 1604, 1475, 1188, 637, 260, 36, 1, 752, 1873, 3692, 4772, 5100, 4329, 2800, 1366, 429, 45, 1]

cp's OEIS Frontend

A199915 Triangle read by rows: T(n,k) is the number of n-step paths from (0,0) to (0,k) that stay in the first quadrant (but may touch the axes) consisting of steps (1,0), (0,1), (0,-1) and (-1,1).

Table of values

List of values