A050016 - cp's OEIS frontend

A050016 a(n) = floor(a(n-1)/2) if this is positive and not yet in the sequence, otherwise a(n) = 9*a(n-1).

n	a(n)
1	1
2	9
3	4
4	2
5	18
6	162
7	81
8	40
9	20
10	10
11	5
12	45
13	22
14	11
15	99
16	49
17	24
18	12
19	6
20	3
21	27
22	13
23	117
24	58
25	29
26	14
27	7
28	63
29	31
30	15
31	135
32	67
33	33
34	16
35	8
36	72
37	36
38	324
39	2916
40	1458
41	729
42	364
43	182
44	91
45	819
46	409
47	204
48	102
49	51
50	25
51	225
52	112
53	56
54	28
55	252
56	126
57	1134

[1, 9, 4, 2, 18, 162, 81, 40, 20, 10, 5, 45, 22, 11, 99, 49, 24, 12, 6, 3, 27, 13, 117, 58, 29, 14, 7, 63, 31, 15, 135, 67, 33, 16, 8, 72, 36, 324, 2916, 1458, 729, 364, 182, 91, 819, 409, 204, 102, 51, 25, 225, 112, 56, 28, 252, 126, 1134]

cp's OEIS Frontend

A050016 a(n) = floor(a(n-1)/2) if this is positive and not yet in the sequence, otherwise a(n) = 9*a(n-1).

Table of values

List of values