A247622 - cp's OEIS frontend

A247622 Triangular array: T(n,k) = number of paths from (0,0) to (n,k), each segment given by a vector (1,1), (1,-1), or (2,0), not crossing the x-axis, and including no horizontal segment on the x-axis.

n	a(n)
0	1
1	0
2	1
3	1
4	0
5	1
6	0
7	3
8	0
9	1
10	3
11	0
12	5
13	0
14	1
15	0
16	11
17	0
18	7
19	0
20	1
21	11
22	0
23	23
24	0
25	9
26	0
27	1
28	0
29	45
30	0
31	39
32	0
33	11
34	0
35	1
36	45
37	0
38	107
39	0
40	59
41	0
42	13
43	0
44	1
45	0
46	197
47	0
48	205
49	0
50	83
51	0
52	15
53	0
54	1
55	197
56	0
57	509
58	0
59	347
60	0
61	111
62	0
63	17
64	0
65	1
66	0
67	903
68	0
69	1061
70	0
71	541
72	0
73	143
74	0

[1, 0, 1, 1, 0, 1, 0, 3, 0, 1, 3, 0, 5, 0, 1, 0, 11, 0, 7, 0, 1, 11, 0, 23, 0, 9, 0, 1, 0, 45, 0, 39, 0, 11, 0, 1, 45, 0, 107, 0, 59, 0, 13, 0, 1, 0, 197, 0, 205, 0, 83, 0, 15, 0, 1, 197, 0, 509, 0, 347, 0, 111, 0, 17, 0, 1, 0, 903, 0, 1061, 0, 541, 0, 143, 0]

cp's OEIS Frontend

A247622 Triangular array: T(n,k) = number of paths from (0,0) to (n,k), each segment given by a vector (1,1), (1,-1), or (2,0), not crossing the x-axis, and including no horizontal segment on the x-axis.

Table of values

List of values