A165781 - cp's OEIS frontend

A165781 a(n) = (2^A002326(n)-1)/(2*n+1).

n	a(n)
0	1
1	1
2	3
3	1
4	7
5	93
6	315
7	1
8	15
9	13797
10	3
11	89
12	41943
13	9709
14	9256395
15	1
16	31
17	117
18	1857283155
19	105
20	25575
21	381
22	91
23	178481
24	42799
25	5
26	84973577874915
27	19065
28	4599
29	4885260612740877
30	18900352534538475
31	1
32	63
33	1101298153654301589

[1, 1, 3, 1, 7, 93, 315, 1, 15, 13797, 3, 89, 41943, 9709, 9256395, 1, 31, 117, 1857283155, 105, 25575, 381, 91, 178481, 42799, 5, 84973577874915, 19065, 4599, 4885260612740877, 18900352534538475, 1, 63, 1101298153654301589]

cp's OEIS Frontend

A165781 a(n) = (2^A002326(n)-1)/(2*n+1).

Table of values

List of values