A102309 - cp's OEIS frontend

A102309 a(n) = Sum_{d divides n} moebius(d) * binomial(n/d,2).

n	a(n)
0	0
1	0
2	1
3	3
4	5
5	10
6	11
7	21
8	22
9	33
10	34
11	55
12	46
13	78
14	69
15	92
16	92
17	136
18	105
19	171
20	140
21	186
22	175
23	253
24	188
25	290
26	246
27	315
28	282
29	406
30	284
31	465
32	376
33	470
34	424
35	564
36	426
37	666
38	531
39	660
40	568
41	820
42	570
43	903
44	710
45	852
46	781
47	1081
48	760
49	1155
50	890
51	1136
52	996
53	1378
54	963
55	1420
56	1140
57	1422
58	1246

[0, 0, 1, 3, 5, 10, 11, 21, 22, 33, 34, 55, 46, 78, 69, 92, 92, 136, 105, 171, 140, 186, 175, 253, 188, 290, 246, 315, 282, 406, 284, 465, 376, 470, 424, 564, 426, 666, 531, 660, 568, 820, 570, 903, 710, 852, 781, 1081, 760, 1155, 890, 1136, 996, 1378, 963, 1420, 1140, 1422, 1246]

cp's OEIS Frontend

A102309 a(n) = Sum_{d divides n} moebius(d) * binomial(n/d,2).

Table of values

List of values