A140733 - cp's OEIS frontend

A140733 Triangle read by rows, X^n * [1,0,0,0,...]; where X = a tridiagonal matrix with (1,1,1,...) in the main and subdiagonals and (1,2,3,...) in the subsubdiagonal.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	2
7	3
8	3
9	3
10	1
11	3
12	6
13	10
14	15
15	15
16	15
17	1
18	4
19	10
20	22
21	43
22	70
23	105
24	105
25	105
26	1
27	5
28	15
29	40
30	95
31	201
32	390
33	630
34	945
35	945
36	945
37	1
38	6
39	21
40	65
41	180
42	456
43	1066
44	2226
45	4305
46	6930
47	10395
48	10395
49	10395
50	1
51	7
52	28
53	98
54	308
55	896
56	2422
57	6028
58	13993
59	29043
60	56070
61	90090

[1, 1, 1, 1, 1, 2, 3, 3, 3, 1, 3, 6, 10, 15, 15, 15, 1, 4, 10, 22, 43, 70, 105, 105, 105, 1, 5, 15, 40, 95, 201, 390, 630, 945, 945, 945, 1, 6, 21, 65, 180, 456, 1066, 2226, 4305, 6930, 10395, 10395, 10395, 1, 7, 28, 98, 308, 896, 2422, 6028, 13993, 29043, 56070, 90090]

cp's OEIS Frontend

A140733 Triangle read by rows, X^n * [1,0,0,0,...]; where X = a tridiagonal matrix with (1,1,1,...) in the main and subdiagonals and (1,2,3,...) in the subsubdiagonal.

Table of values

List of values