A008457 - cp's OEIS frontend

A008457 a(n) = Sum_{ d >= 1, d divides n} (-1)^(n-d)*d^3.

n	a(n)
1	1
2	7
3	28
4	71
5	126
6	196
7	344
8	583
9	757
10	882
11	1332
12	1988
13	2198
14	2408
15	3528
16	4679
17	4914
18	5299
19	6860
20	8946
21	9632
22	9324
23	12168
24	16324
25	15751
26	15386
27	20440
28	24424
29	24390
30	24696
31	29792
32	37447
33	37296
34	34398
35	43344
36	53747
37	50654
38	48020
39	61544
40	73458

[1, 7, 28, 71, 126, 196, 344, 583, 757, 882, 1332, 1988, 2198, 2408, 3528, 4679, 4914, 5299, 6860, 8946, 9632, 9324, 12168, 16324, 15751, 15386, 20440, 24424, 24390, 24696, 29792, 37447, 37296, 34398, 43344, 53747, 50654, 48020, 61544, 73458]

cp's OEIS Frontend

A008457 a(n) = Sum_{ d >= 1, d divides n} (-1)^(n-d)*d^3.

Table of values

List of values