A205957 - cp's OEIS frontend

A205957 a(n) = exp(-Sum_{k=1..n} Sum_{d|k, d prime} moebius(d)*log(k/d)).

n	a(n)
0	1
1	1
2	1
3	1
4	2
5	2
6	12
7	12
8	48
9	144
10	1440
11	1440
12	34560
13	34560
14	483840
15	7257600
16	58060800
17	58060800
18	3135283200
19	3135283200
20	125411328000
21	2633637888000
22	57940033536000
23	57940033536000
24	5562243219456000
25	27811216097280000
26	723091618529280000
27	6507824566763520000

[1, 1, 1, 1, 2, 2, 12, 12, 48, 144, 1440, 1440, 34560, 34560, 483840, 7257600, 58060800, 58060800, 3135283200, 3135283200, 125411328000, 2633637888000, 57940033536000, 57940033536000, 5562243219456000, 27811216097280000, 723091618529280000, 6507824566763520000]

cp's OEIS Frontend

A205957 a(n) = exp(-Sum_{k=1..n} Sum_{d|k, d prime} moebius(d)*log(k/d)).

Table of values

List of values