A140071 - cp's OEIS frontend

A140071 Triangle read by rows: iterates of X * [1,0,0,0,...]; where X = an infinite lower bidiagonal matrix with [3,1,3,1,3,1...] in the main diagonal and [1,1,1,...] in the subdiagonal.

n	a(n)
1	1
2	3
3	1
4	9
5	4
6	1
7	27
8	13
9	7
10	1
11	81
12	40
13	34
14	8
15	1
16	243
17	121
18	142
19	42
20	11
21	1
22	729
23	364
24	547
25	184
26	75
27	12
28	1
29	2187
30	1093
31	2005
32	731
33	409
34	87
35	15
36	1
37	6561
38	3280
39	7108
40	2736
41	1958
42	496
43	132
44	16
45	1
46	19683
47	9841
48	24604
49	9844
50	8610
51	2454
52	892
53	148
54	19
55	1

[1, 3, 1, 9, 4, 1, 27, 13, 7, 1, 81, 40, 34, 8, 1, 243, 121, 142, 42, 11, 1, 729, 364, 547, 184, 75, 12, 1, 2187, 1093, 2005, 731, 409, 87, 15, 1, 6561, 3280, 7108, 2736, 1958, 496, 132, 16, 1, 19683, 9841, 24604, 9844, 8610, 2454, 892, 148, 19, 1]

cp's OEIS Frontend

A140071 Triangle read by rows: iterates of X * [1,0,0,0,...]; where X = an infinite lower bidiagonal matrix with [3,1,3,1,3,1...] in the main diagonal and [1,1,1,...] in the subdiagonal.

Table of values

List of values