A026148 - cp's OEIS frontend

A026148 Irregular triangular array T read by rows: T(n,0) = 1 for i >= 0, T(1,1) = 1,T(2,1) = 1, T(2,2) = 2, T(2,3) = 1, T(2,4) = 1 and for n >= 3, T(n,1) = n-1, T(n,k) = T(n-1,k-2) + T(n-1,k-1) + T(n-1,k) for k=2,...,n+1, and T(n, k+2) = T(n-1, k) + T(n-1, k+1).

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	2
7	1
8	1
9	1
10	2
11	4
12	4
13	4
14	2
15	1
16	3
17	7
18	10
19	12
20	10
21	6
22	1
23	4
24	11
25	20
26	29
27	32
28	28
29	16
30	1
31	5
32	16
33	35
34	60
35	81
36	89
37	76
38	44
39	1
40	6
41	22
42	56
43	111
44	176
45	230
46	246
47	209
48	120
49	1
50	7
51	29
52	84
53	189
54	343
55	517
56	652
57	685
58	575
59	329
60	1
61	8
62	37
63	120
64	302
65	616
66	1049
67	1512
68	1854
69	1912
70	1589
71	904
72	1
73	9
74	46
75	165

[1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 4, 4, 4, 2, 1, 3, 7, 10, 12, 10, 6, 1, 4, 11, 20, 29, 32, 28, 16, 1, 5, 16, 35, 60, 81, 89, 76, 44, 1, 6, 22, 56, 111, 176, 230, 246, 209, 120, 1, 7, 29, 84, 189, 343, 517, 652, 685, 575, 329, 1, 8, 37, 120, 302, 616, 1049, 1512, 1854, 1912, 1589, 904, 1, 9, 46, 165]

cp's OEIS Frontend

A026148 Irregular triangular array T read by rows: T(n,0) = 1 for i >= 0, T(1,1) = 1,T(2,1) = 1, T(2,2) = 2, T(2,3) = 1, T(2,4) = 1 and for n >= 3, T(n,1) = n-1, T(n,k) = T(n-1,k-2) + T(n-1,k-1) + T(n-1,k) for k=2,...,n+1, and T(n, k+2) = T(n-1, k) + T(n-1, k+1).

Table of values

List of values