A078306 - cp's OEIS frontend

A078306 a(n) = Sum_{d divides n} (-1)^(n/d+1)*d^2.

n	a(n)
1	1
2	3
3	10
4	11
5	26
6	30
7	50
8	43
9	91
10	78
11	122
12	110
13	170
14	150
15	260
16	171
17	290
18	273
19	362
20	286
21	500
22	366
23	530
24	430
25	651
26	510
27	820
28	550
29	842
30	780
31	962
32	683
33	1220
34	870
35	1300
36	1001
37	1370
38	1086
39	1700
40	1118
41	1682
42	1500
43	1850
44	1342
45	2366
46	1590
47	2210
48	1710
49	2451
50	1953

[1, 3, 10, 11, 26, 30, 50, 43, 91, 78, 122, 110, 170, 150, 260, 171, 290, 273, 362, 286, 500, 366, 530, 430, 651, 510, 820, 550, 842, 780, 962, 683, 1220, 870, 1300, 1001, 1370, 1086, 1700, 1118, 1682, 1500, 1850, 1342, 2366, 1590, 2210, 1710, 2451, 1953]

cp's OEIS Frontend

A078306 a(n) = Sum_{d divides n} (-1)^(n/d+1)*d^2.

Table of values

List of values