A140734 - cp's OEIS frontend

A140734 Triangle read by rows, X^n * [1,0,0,0,...]; where X = a tridiagonal matrix with (1,1,1,...) in the main and subsubdiagonals and (1,2,3,...) in the subdiagonal.

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	2
7	4
8	4
9	1
10	1
11	3
12	9
13	18
14	21
15	9
16	1
17	1
18	4
19	16
20	48
21	102
22	132
23	76
24	16
25	1
26	1
27	5
28	25
29	100
30	310
31	690
32	970
33	680
34	205
35	25
36	1
37	1
38	6
39	36
40	180
41	735
42	2340
43	5420
44	8160
45	2550
46	456
47	36
48	1
49	1
50	7
51	49
52	294
53	1491
54	6195
55	20195
56	48440
57	778315
58	70245
59	32571
60	7602
61	889
62	49
63	1

[1, 1, 1, 1, 1, 2, 4, 4, 1, 1, 3, 9, 18, 21, 9, 1, 1, 4, 16, 48, 102, 132, 76, 16, 1, 1, 5, 25, 100, 310, 690, 970, 680, 205, 25, 1, 1, 6, 36, 180, 735, 2340, 5420, 8160, 2550, 456, 36, 1, 1, 7, 49, 294, 1491, 6195, 20195, 48440, 778315, 70245, 32571, 7602, 889, 49, 1]

cp's OEIS Frontend

A140734 Triangle read by rows, X^n * [1,0,0,0,...]; where X = a tridiagonal matrix with (1,1,1,...) in the main and subsubdiagonals and (1,2,3,...) in the subdiagonal.

Table of values

List of values