A326503 - cp's OEIS frontend

A326503 Expansion of Sum_{k>=1} x^k * (1 - x^(2k)) / (1 + x^k + x^(2k))^2.

n	a(n)
1	1
2	-1
3	1
4	3
5	-4
6	-1
7	8
8	-5
9	1
10	4
11	-10
12	3
13	14
14	-8
15	-4
16	11
17	-16
18	-1
19	20
20	-12
21	8
22	10
23	-22
24	-5
25	21
26	-14
27	1
28	24
29	-28
30	4
31	32
32	-21
33	-10
34	16
35	-32
36	3
37	38
38	-20
39	14
40	20
41	-40
42	-8
43	44
44	-30
45	-4
46	22
47	-46
48	11
49	57
50	-21
51	-16
52	42
53	-52
54	-1
55	40
56	-40
57	20
58	28
59	-58
60	-12
61	62
62	-32
63	8
64	43
65	-56
66	10

[1, -1, 1, 3, -4, -1, 8, -5, 1, 4, -10, 3, 14, -8, -4, 11, -16, -1, 20, -12, 8, 10, -22, -5, 21, -14, 1, 24, -28, 4, 32, -21, -10, 16, -32, 3, 38, -20, 14, 20, -40, -8, 44, -30, -4, 22, -46, 11, 57, -21, -16, 42, -52, -1, 40, -40, 20, 28, -58, -12, 62, -32, 8, 43, -56, 10]

cp's OEIS Frontend

A326503 Expansion of Sum_{k>=1} x^k * (1 - x^(2k)) / (1 + x^k + x^(2k))^2.

Table of values

List of values

n	a(n)
1	1
2	-1
3	1
4	3
5	-4
6	-1
7	8
8	-5
9	1
10	4
11	-10
12	3
13	14
14	-8
15	-4
16	11
17	-16
18	-1
19	20
20	-12
21	8
22	10
23	-22
24	-5
25	21
26	-14
27	1
28	24
29	-28
30	4
31	32
32	-21
33	-10
34	16
35	-32
36	3
37	38
38	-20
39	14
40	20
41	-40
42	-8
43	44
44	-30
45	-4
46	22
47	-46
48	11
49	57
50	-21
51	-16
52	42
53	-52
54	-1
55	40
56	-40
57	20
58	28
59	-58
60	-12
61	62
62	-32
63	8
64	43
65	-56
66	10

n	a(n)
1	1
2	-1
3	1
4	3
5	-4
6	-1
7	8
8	-5
9	1
10	4
11	-10
12	3
13	14
14	-8
15	-4
16	11
17	-16
18	-1
19	20
20	-12
21	8
22	10
23	-22
24	-5
25	21
26	-14
27	1
28	24
29	-28
30	4
31	32
32	-21
33	-10
34	16
35	-32
36	3
37	38
38	-20
39	14
40	20
41	-40
42	-8
43	44
44	-30
45	-4
46	22
47	-46
48	11
49	57
50	-21
51	-16
52	42
53	-52
54	-1
55	40
56	-40
57	20
58	28
59	-58
60	-12
61	62
62	-32
63	8
64	43
65	-56
66	10

cp's OEIS Frontend

A326503 Expansion of Sum_{k>=1} x^k * (1 - x^(2*k)) / (1 + x^k + x^(2*k))^2.

Table of values

List of values

A326503 Expansion of Sum_{k>=1} x^k * (1 - x^(2k)) / (1 + x^k + x^(2k))^2.

n	a(n)
1	1
2	-1
3	1
4	3
5	-4
6	-1
7	8
8	-5
9	1
10	4
11	-10
12	3
13	14
14	-8
15	-4
16	11
17	-16
18	-1
19	20
20	-12
21	8
22	10
23	-22
24	-5
25	21
26	-14
27	1
28	24
29	-28
30	4
31	32
32	-21
33	-10
34	16
35	-32
36	3
37	38
38	-20
39	14
40	20
41	-40
42	-8
43	44
44	-30
45	-4
46	22
47	-46
48	11
49	57
50	-21
51	-16
52	42
53	-52
54	-1
55	40
56	-40
57	20
58	28
59	-58
60	-12
61	62
62	-32
63	8
64	43
65	-56
66	10