A026009 - cp's OEIS frontend

A026009 Triangular array T read by rows: T(n,0) = 1 for n >= 0; T(1,1) = 1; and for n >= 2, T(n,k) = T(n-1,k-1) + T(n-1,k) for k = 1,2,...,[(n+1)/2]; T(n,n/2 + 1) = T(n-1,n/2) if n is even.

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	1
6	1
7	3
8	3
9	1
10	4
11	6
12	3
13	1
14	5
15	10
16	9
17	1
18	6
19	15
20	19
21	9
22	1
23	7
24	21
25	34
26	28
27	1
28	8
29	28
30	55
31	62
32	28
33	1
34	9
35	36
36	83
37	117
38	90
39	1
40	10
41	45
42	119
43	200
44	207
45	90
46	1
47	11
48	55
49	164
50	319
51	407
52	297
53	1
54	12
55	66
56	219
57	483
58	726
59	704
60	297
61	1
62	13
63	78
64	285
65	702
66	1209
67	1430
68	1001
69	1
70	14
71	91
72	363
73	987
74	1911
75	2639
76	2431
77	1001

[1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 4, 6, 3, 1, 5, 10, 9, 1, 6, 15, 19, 9, 1, 7, 21, 34, 28, 1, 8, 28, 55, 62, 28, 1, 9, 36, 83, 117, 90, 1, 10, 45, 119, 200, 207, 90, 1, 11, 55, 164, 319, 407, 297, 1, 12, 66, 219, 483, 726, 704, 297, 1, 13, 78, 285, 702, 1209, 1430, 1001, 1, 14, 91, 363, 987, 1911, 2639, 2431, 1001]

cp's OEIS Frontend

A026009 Triangular array T read by rows: T(n,0) = 1 for n >= 0; T(1,1) = 1; and for n >= 2, T(n,k) = T(n-1,k-1) + T(n-1,k) for k = 1,2,...,[(n+1)/2]; T(n,n/2 + 1) = T(n-1,n/2) if n is even.

Table of values

List of values