A258453 - cp's OEIS frontend

A258453 G.f.: Sum_{k>0} x^((k^2 + k)/2) / (1 + x^k).

n	a(n)
1	1
2	-1
3	2
4	-1
5	0
6	0
7	2
8	-1
9	-1
10	0
11	2
12	0
13	0
14	-2
15	2
16	-1
17	0
18	1
19	2
20	-2
21	0
22	-2
23	2
24	0
25	1
26	0
27	0
28	0
29	0
30	-2
31	2
32	-1
33	0
34	0
35	2
36	1
37	0
38	-2
39	0
40	-2
41	0
42	2
43	2
44	-2
45	2
46	-2
47	2
48	0
49	-1
50	-1
51	0
52	0
53	0
54	-2
55	4
56	0
57	0
58	0
59	2
60	-2
61	0
62	-2
63	0
64	-1
65	0
66	2
67	2
68	0
69	0
70	-2
71	2
72	-1
73	0
74	0
75	2
76	-2
77	-2
78	0
79	2

[1, -1, 2, -1, 0, 0, 2, -1, -1, 0, 2, 0, 0, -2, 2, -1, 0, 1, 2, -2, 0, -2, 2, 0, 1, 0, 0, 0, 0, -2, 2, -1, 0, 0, 2, 1, 0, -2, 0, -2, 0, 2, 2, -2, 2, -2, 2, 0, -1, -1, 0, 0, 0, -2, 4, 0, 0, 0, 2, -2, 0, -2, 0, -1, 0, 2, 2, 0, 0, -2, 2, -1, 0, 0, 2, -2, -2, 0, 2]

cp's OEIS Frontend

A258453 G.f.: Sum_{k>0} x^((k^2 + k)/2) / (1 + x^k).

Table of values

List of values

n	a(n)
1	1
2	-1
3	2
4	-1
5	0
6	0
7	2
8	-1
9	-1
10	0
11	2
12	0
13	0
14	-2
15	2
16	-1
17	0
18	1
19	2
20	-2
21	0
22	-2
23	2
24	0
25	1
26	0
27	0
28	0
29	0
30	-2
31	2
32	-1
33	0
34	0
35	2
36	1
37	0
38	-2
39	0
40	-2
41	0
42	2
43	2
44	-2
45	2
46	-2
47	2
48	0
49	-1
50	-1
51	0
52	0
53	0
54	-2
55	4
56	0
57	0
58	0
59	2
60	-2
61	0
62	-2
63	0
64	-1
65	0
66	2
67	2
68	0
69	0
70	-2
71	2
72	-1
73	0
74	0
75	2
76	-2
77	-2
78	0
79	2

n	a(n)
1	1
2	-1
3	2
4	-1
5	0
6	0
7	2
8	-1
9	-1
10	0
11	2
12	0
13	0
14	-2
15	2
16	-1
17	0
18	1
19	2
20	-2
21	0
22	-2
23	2
24	0
25	1
26	0
27	0
28	0
29	0
30	-2
31	2
32	-1
33	0
34	0
35	2
36	1
37	0
38	-2
39	0
40	-2
41	0
42	2
43	2
44	-2
45	2
46	-2
47	2
48	0
49	-1
50	-1
51	0
52	0
53	0
54	-2
55	4
56	0
57	0
58	0
59	2
60	-2
61	0
62	-2
63	0
64	-1
65	0
66	2
67	2
68	0
69	0
70	-2
71	2
72	-1
73	0
74	0
75	2
76	-2
77	-2
78	0
79	2

n	a(n)
1	1
2	-1
3	2
4	-1
5	0
6	0
7	2
8	-1
9	-1
10	0
11	2
12	0
13	0
14	-2
15	2
16	-1
17	0
18	1
19	2
20	-2
21	0
22	-2
23	2
24	0
25	1
26	0
27	0
28	0
29	0
30	-2
31	2
32	-1
33	0
34	0
35	2
36	1
37	0
38	-2
39	0
40	-2
41	0
42	2
43	2
44	-2
45	2
46	-2
47	2
48	0
49	-1
50	-1
51	0
52	0
53	0
54	-2
55	4
56	0
57	0
58	0
59	2
60	-2
61	0
62	-2
63	0
64	-1
65	0
66	2
67	2
68	0
69	0
70	-2
71	2
72	-1
73	0
74	0
75	2
76	-2
77	-2
78	0
79	2