A325940 - cp's OEIS frontend

A325940 Expansion of Sum_{k>=1} x^(2*k) / (1 + x^k)^2.

n	a(n)
1	0
2	1
3	-2
4	4
5	-4
6	4
7	-6
8	11
9	-10
10	6
11	-10
12	18
13	-12
14	8
15	-20
16	26
17	-16
18	13
19	-18
20	28
21	-28
22	12
23	-22
24	48
25	-28
26	14
27	-36
28	38
29	-28
30	24
31	-30
32	57
33	-44
34	18
35	-44
36	62
37	-36
38	20
39	-52
40	74
41	-40
42	32
43	-42
44	58
45	-72
46	24
47	-46
48	110
49	-54
50	31
51	-68
52	68
53	-52
54	40
55	-68
56	100
57	-76
58	30
59	-58
60	116

[0, 1, -2, 4, -4, 4, -6, 11, -10, 6, -10, 18, -12, 8, -20, 26, -16, 13, -18, 28, -28, 12, -22, 48, -28, 14, -36, 38, -28, 24, -30, 57, -44, 18, -44, 62, -36, 20, -52, 74, -40, 32, -42, 58, -72, 24, -46, 110, -54, 31, -68, 68, -52, 40, -68, 100, -76, 30, -58, 116]

cp's OEIS Frontend

A325940 Expansion of Sum_{k>=1} x^(2*k) / (1 + x^k)^2.

Table of values

List of values

n	a(n)
1	0
2	1
3	-2
4	4
5	-4
6	4
7	-6
8	11
9	-10
10	6
11	-10
12	18
13	-12
14	8
15	-20
16	26
17	-16
18	13
19	-18
20	28
21	-28
22	12
23	-22
24	48
25	-28
26	14
27	-36
28	38
29	-28
30	24
31	-30
32	57
33	-44
34	18
35	-44
36	62
37	-36
38	20
39	-52
40	74
41	-40
42	32
43	-42
44	58
45	-72
46	24
47	-46
48	110
49	-54
50	31
51	-68
52	68
53	-52
54	40
55	-68
56	100
57	-76
58	30
59	-58
60	116

n	a(n)
1	0
2	1
3	-2
4	4
5	-4
6	4
7	-6
8	11
9	-10
10	6
11	-10
12	18
13	-12
14	8
15	-20
16	26
17	-16
18	13
19	-18
20	28
21	-28
22	12
23	-22
24	48
25	-28
26	14
27	-36
28	38
29	-28
30	24
31	-30
32	57
33	-44
34	18
35	-44
36	62
37	-36
38	20
39	-52
40	74
41	-40
42	32
43	-42
44	58
45	-72
46	24
47	-46
48	110
49	-54
50	31
51	-68
52	68
53	-52
54	40
55	-68
56	100
57	-76
58	30
59	-58
60	116

n	a(n)
1	0
2	1
3	-2
4	4
5	-4
6	4
7	-6
8	11
9	-10
10	6
11	-10
12	18
13	-12
14	8
15	-20
16	26
17	-16
18	13
19	-18
20	28
21	-28
22	12
23	-22
24	48
25	-28
26	14
27	-36
28	38
29	-28
30	24
31	-30
32	57
33	-44
34	18
35	-44
36	62
37	-36
38	20
39	-52
40	74
41	-40
42	32
43	-42
44	58
45	-72
46	24
47	-46
48	110
49	-54
50	31
51	-68
52	68
53	-52
54	40
55	-68
56	100
57	-76
58	30
59	-58
60	116