A366970 - cp's OEIS frontend

A366970 a(n) = Sum_{k=3..n} binomial(k-1,2) * floor(n/k).

n	a(n)
1	0
2	0
3	1
4	4
5	10
6	21
7	36
8	60
9	89
10	131
11	176
12	245
13	311
14	404
15	502
16	631
17	751
18	926
19	1079
20	1295
21	1501
22	1756
23	1987
24	2330
25	2612
26	2978
27	3332
28	3779
29	4157
30	4707
31	5142
32	5736
33	6278
34	6926
35	7508
36	8336
37	8966
38	9785
39	10555
40	11533
41	12313
42	13427
43	14288
44	15449
45	16521
46	17742
47	18777
48	20306

[0, 0, 1, 4, 10, 21, 36, 60, 89, 131, 176, 245, 311, 404, 502, 631, 751, 926, 1079, 1295, 1501, 1756, 1987, 2330, 2612, 2978, 3332, 3779, 4157, 4707, 5142, 5736, 6278, 6926, 7508, 8336, 8966, 9785, 10555, 11533, 12313, 13427, 14288, 15449, 16521, 17742, 18777, 20306]

cp's OEIS Frontend

A366970 a(n) = Sum_{k=3..n} binomial(k-1,2) * floor(n/k).

Table of values

List of values