A047654 - cp's OEIS frontend

A047654 Expansion of (Product_{j>=1} (1-(-x)^j) - 1)^2 in powers of x.

n	a(n)
2	1
3	-2
4	1
5	0
6	-2
7	2
8	-2
9	2
10	1
11	0
12	2
13	-2
14	3
15	0
16	2
17	0
18	0
19	2
20	-2
21	0
22	-2
23	2
24	-1
25	0
26	0
27	-2
28	-2
29	-2
30	1
31	-2
32	0
33	-2
34	-2
35	0
36	2
37	0
38	-2
39	0
40	-2
41	0
42	0
43	0
44	1
45	2
46	0
47	0
48	2
49	0
50	2
51	0
52	1
53	2
54	0
55	-2
56	2
57	2
58	0
59	2
60	0
61	2
62	0
63	2
64	2
65	0
66	-4
67	0
68	0
69	2
70	1
71	-2
72	0
73	-2
74	0
75	0
76	0
77	0
78	2
79	-4
80	1
81	0
82	0
83	-2
84	-2
85	-2
86	-2
87	0
88	0
89	-2
90	0
91	2
92	-2
93	2
94	-2

[1, -2, 1, 0, -2, 2, -2, 2, 1, 0, 2, -2, 3, 0, 2, 0, 0, 2, -2, 0, -2, 2, -1, 0, 0, -2, -2, -2, 1, -2, 0, -2, -2, 0, 2, 0, -2, 0, -2, 0, 0, 0, 1, 2, 0, 0, 2, 0, 2, 0, 1, 2, 0, -2, 2, 2, 0, 2, 0, 2, 0, 2, 2, 0, -4, 0, 0, 2, 1, -2, 0, -2, 0, 0, 0, 0, 2, -4, 1, 0, 0, -2, -2, -2, -2, 0, 0, -2, 0, 2, -2, 2, -2]

cp's OEIS Frontend

A047654 Expansion of (Product_{j>=1} (1-(-x)^j) - 1)^2 in powers of x.

Table of values

List of values

n	a(n)
2	1
3	-2
4	1
5	0
6	-2
7	2
8	-2
9	2
10	1
11	0
12	2
13	-2
14	3
15	0
16	2
17	0
18	0
19	2
20	-2
21	0
22	-2
23	2
24	-1
25	0
26	0
27	-2
28	-2
29	-2
30	1
31	-2
32	0
33	-2
34	-2
35	0
36	2
37	0
38	-2
39	0
40	-2
41	0
42	0
43	0
44	1
45	2
46	0
47	0
48	2
49	0
50	2
51	0
52	1
53	2
54	0
55	-2
56	2
57	2
58	0
59	2
60	0
61	2
62	0
63	2
64	2
65	0
66	-4
67	0
68	0
69	2
70	1
71	-2
72	0
73	-2
74	0
75	0
76	0
77	0
78	2
79	-4
80	1
81	0
82	0
83	-2
84	-2
85	-2
86	-2
87	0
88	0
89	-2
90	0
91	2
92	-2
93	2
94	-2

n	a(n)
2	1
3	-2
4	1
5	0
6	-2
7	2
8	-2
9	2
10	1
11	0
12	2
13	-2
14	3
15	0
16	2
17	0
18	0
19	2
20	-2
21	0
22	-2
23	2
24	-1
25	0
26	0
27	-2
28	-2
29	-2
30	1
31	-2
32	0
33	-2
34	-2
35	0
36	2
37	0
38	-2
39	0
40	-2
41	0
42	0
43	0
44	1
45	2
46	0
47	0
48	2
49	0
50	2
51	0
52	1
53	2
54	0
55	-2
56	2
57	2
58	0
59	2
60	0
61	2
62	0
63	2
64	2
65	0
66	-4
67	0
68	0
69	2
70	1
71	-2
72	0
73	-2
74	0
75	0
76	0
77	0
78	2
79	-4
80	1
81	0
82	0
83	-2
84	-2
85	-2
86	-2
87	0
88	0
89	-2
90	0
91	2
92	-2
93	2
94	-2

n	a(n)
2	1
3	-2
4	1
5	0
6	-2
7	2
8	-2
9	2
10	1
11	0
12	2
13	-2
14	3
15	0
16	2
17	0
18	0
19	2
20	-2
21	0
22	-2
23	2
24	-1
25	0
26	0
27	-2
28	-2
29	-2
30	1
31	-2
32	0
33	-2
34	-2
35	0
36	2
37	0
38	-2
39	0
40	-2
41	0
42	0
43	0
44	1
45	2
46	0
47	0
48	2
49	0
50	2
51	0
52	1
53	2
54	0
55	-2
56	2
57	2
58	0
59	2
60	0
61	2
62	0
63	2
64	2
65	0
66	-4
67	0
68	0
69	2
70	1
71	-2
72	0
73	-2
74	0
75	0
76	0
77	0
78	2
79	-4
80	1
81	0
82	0
83	-2
84	-2
85	-2
86	-2
87	0
88	0
89	-2
90	0
91	2
92	-2
93	2
94	-2