A366395 - cp's OEIS frontend

A366395 a(n) = Sum_{k=1..n} (-1)^(k-1) * binomial(floor(n/k)+2,3).

n	a(n)
1	1
2	3
3	10
4	16
5	32
6	49
7	78
8	100
9	152
10	194
11	261
12	318
13	410
14	489
15	631
16	717
17	871
18	1014
19	1205
20	1351
21	1617
22	1806
23	2083
24	2300
25	2641
26	2903
27	3333
28	3612
29	4048
30	4450
31	4947
32	5289
33	5923
34	6367
35	7041
36	7548
37	8252
38	8805
39	9683
40	10245
41	11107
42	11873
43	12820
44	13497
45	14719
46	15526
47	16655

[1, 3, 10, 16, 32, 49, 78, 100, 152, 194, 261, 318, 410, 489, 631, 717, 871, 1014, 1205, 1351, 1617, 1806, 2083, 2300, 2641, 2903, 3333, 3612, 4048, 4450, 4947, 5289, 5923, 6367, 7041, 7548, 8252, 8805, 9683, 10245, 11107, 11873, 12820, 13497, 14719, 15526, 16655]

cp's OEIS Frontend

A366395 a(n) = Sum_{k=1..n} (-1)^(k-1) * binomial(floor(n/k)+2,3).

Table of values

List of values