A026022 - cp's OEIS frontend

A026022 Triangular array T read by rows: T(n,0) = 1 for n >= 0; T(n,k) = C(n,k) for k = 1,2,...,n, for n = 1,2,3; and for n >= 4, T(n,k) = T(n-1,k-1) + T(n-1,k) for k = 1,2,...,[ (n+2)/2 ] and T(n,(n+3)/2) = T(n-1,(n+1)/2) if n is odd.

n	a(n)
1	1
2	1
3	1
4	1
5	2
6	1
7	1
8	3
9	3
10	1
11	1
12	4
13	6
14	4
15	1
16	5
17	10
18	10
19	4
20	1
21	6
22	15
23	20
24	14
25	1
26	7
27	21
28	35
29	34
30	14
31	1
32	8
33	28
34	56
35	69
36	48
37	1
38	9
39	36
40	84
41	125
42	117
43	48
44	1
45	10
46	45
47	120
48	209
49	242
50	165
51	1
52	11
53	55
54	165
55	329
56	451
57	407
58	165
59	1
60	12
61	66
62	220
63	494
64	780
65	858
66	572
67	1
68	13
69	78
70	286
71	714
72	1274
73	1638
74	1430
75	572

[1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 6, 4, 1, 5, 10, 10, 4, 1, 6, 15, 20, 14, 1, 7, 21, 35, 34, 14, 1, 8, 28, 56, 69, 48, 1, 9, 36, 84, 125, 117, 48, 1, 10, 45, 120, 209, 242, 165, 1, 11, 55, 165, 329, 451, 407, 165, 1, 12, 66, 220, 494, 780, 858, 572, 1, 13, 78, 286, 714, 1274, 1638, 1430, 572]

cp's OEIS Frontend

A026022 Triangular array T read by rows: T(n,0) = 1 for n >= 0; T(n,k) = C(n,k) for k = 1,2,...,n, for n = 1,2,3; and for n >= 4, T(n,k) = T(n-1,k-1) + T(n-1,k) for k = 1,2,...,[ (n+2)/2 ] and T(n,(n+3)/2) = T(n-1,(n+1)/2) if n is odd.

Table of values

List of values