A350162 - cp's OEIS frontend

A350162 a(n) = Sum_{k=1..n} (-1)^(k+1) * floor(n/(2*k-1))^2.

n	a(n)
1	1
2	4
3	8
4	15
5	25
6	33
7	45
8	60
9	73
10	95
11	115
12	131
13	157
14	181
15	205
16	236
17	270
18	297
19	333
20	379
21	403
22	443
23	487
24	519
25	578
26	632
27	672
28	720
29	778
30	826
31	886
32	949
33	989
34	1059
35	1131
36	1186
37	1260
38	1332
39	1388
40	1482
41	1564
42	1612
43	1696
44	1776
45	1858
46	1946
47	2038
48	2102
49	2187
50	2308
51	2380
52	2490

[1, 4, 8, 15, 25, 33, 45, 60, 73, 95, 115, 131, 157, 181, 205, 236, 270, 297, 333, 379, 403, 443, 487, 519, 578, 632, 672, 720, 778, 826, 886, 949, 989, 1059, 1131, 1186, 1260, 1332, 1388, 1482, 1564, 1612, 1696, 1776, 1858, 1946, 2038, 2102, 2187, 2308, 2380, 2490]

cp's OEIS Frontend

A350162 a(n) = Sum_{k=1..n} (-1)^(k+1) * floor(n/(2*k-1))^2.

Table of values

List of values