A174940 - cp's OEIS frontend

A174940 a(n) = Sum_{d|n} A007955(d) * A008683(n/d) = Sum_{d|n} A007955(d) * mu(n/d), where A007955(m) = number of divisors of m.

n	a(n)
1	1
2	1
3	2
4	6
5	4
6	32
7	6
8	56
9	24
10	94
11	10
12	1686
13	12
14	188
15	218
16	960
17	16
18	5772
19	18
20	7894
21	432
22	472
23	22
24	329992
25	120
26	662
27	702
28	21750
29	28
30	809648
31	30
32	31744
33	1076
34	1138
35	1214
36	10070172
37	36
38	1424
39	1506
40	2551944
41	40
42	3111034
43	42
44	84694
45	90876
46	2092
47	46
48	254471232
49	336
50	124780

[1, 1, 2, 6, 4, 32, 6, 56, 24, 94, 10, 1686, 12, 188, 218, 960, 16, 5772, 18, 7894, 432, 472, 22, 329992, 120, 662, 702, 21750, 28, 809648, 30, 31744, 1076, 1138, 1214, 10070172, 36, 1424, 1506, 2551944, 40, 3111034, 42, 84694, 90876, 2092, 46, 254471232, 336, 124780]

cp's OEIS Frontend

A174940 a(n) = Sum_{d|n} A007955(d) * A008683(n/d) = Sum_{d|n} A007955(d) * mu(n/d), where A007955(m) = number of divisors of m.

Table of values

List of values