A365007 - cp's OEIS frontend

A365007 a(n) = Sum_{d|n} (-1)^(n/d-1) * binomial(d+1,2).

n	a(n)
1	1
2	2
3	7
4	6
5	16
6	17
7	29
8	22
9	52
10	42
11	67
12	57
13	92
14	79
15	142
16	86
17	154
18	143
19	191
20	146
21	266
22	189
23	277
24	217
25	341
26	262
27	430
28	279
29	436
30	402
31	497
32	342
33	634
34	444
35	674
36	507
37	704
38	553
39	878
40	562
41	862
42	766
43	947
44	677
45	1222
46	807
47	1129
48	857
49	1254
50	992
51	1486
52	942
53	1432
54	1250
55	1622
56	1079

[1, 2, 7, 6, 16, 17, 29, 22, 52, 42, 67, 57, 92, 79, 142, 86, 154, 143, 191, 146, 266, 189, 277, 217, 341, 262, 430, 279, 436, 402, 497, 342, 634, 444, 674, 507, 704, 553, 878, 562, 862, 766, 947, 677, 1222, 807, 1129, 857, 1254, 992, 1486, 942, 1432, 1250, 1622, 1079]

cp's OEIS Frontend

A365007 a(n) = Sum_{d|n} (-1)^(n/d-1) * binomial(d+1,2).

Table of values

List of values