A290650 - cp's OEIS frontend

A290650 a(1) = 1. For n > 1, a(n) = a(n-1)/2 if a(n-1) is even, a(n) = a(n-1)*n otherwise.

n	a(n)
1	1
2	2
3	1
4	4
5	2
6	1
7	7
8	56
9	28
10	14
11	7
12	84
13	42
14	21
15	315
16	5040
17	2520
18	1260
19	630
20	315
21	6615
22	145530
23	72765
24	1746360
25	873180
26	436590
27	218295
28	6112260
29	3056130
30	1528065
31	47370015
32	1515840480
33	757920240
34	378960120

[1, 2, 1, 4, 2, 1, 7, 56, 28, 14, 7, 84, 42, 21, 315, 5040, 2520, 1260, 630, 315, 6615, 145530, 72765, 1746360, 873180, 436590, 218295, 6112260, 3056130, 1528065, 47370015, 1515840480, 757920240, 378960120]

cp's OEIS Frontend

A290650 a(1) = 1. For n > 1, a(n) = a(n-1)/2 if a(n-1) is even, a(n) = a(n-1)*n otherwise.

Table of values

List of values