A139093 - cp's OEIS frontend

A139093 Expansion of phi(q) * phi(-q^2) in powers of q where phi() is a Ramanujan theta function.

n	a(n)
0	1
1	2
2	-2
3	-4
4	2
5	0
6	-4
7	0
8	2
9	6
10	0
11	-4
12	4
13	0
14	0
15	0
16	2
17	4
18	-6
19	-4
20	0
21	0
22	-4
23	0
24	4
25	2
26	0
27	-8
28	0
29	0
30	0
31	0
32	2
33	8
34	-4
35	0
36	6
37	0
38	-4
39	0
40	0
41	4
42	0
43	-4
44	4
45	0
46	0
47	0
48	4
49	2
50	-2
51	-8
52	0
53	0
54	-8
55	0
56	0
57	8
58	0
59	-4
60	0
61	0
62	0
63	0
64	2
65	0
66	-8
67	-4
68	4
69	0
70	0
71	0
72	6
73	4
74	0
75	-4
76	4
77	0
78	0
79	0
80	0
81	10
82	-4
83	-4
84	0
85	0
86	-4
87	0
88	4
89	4
90	0
91	0
92	0
93	0
94	0
95	0
96	4
97	4
98	-2
99	-12
100	2
101	0
102	-8
103	0

[1, 2, -2, -4, 2, 0, -4, 0, 2, 6, 0, -4, 4, 0, 0, 0, 2, 4, -6, -4, 0, 0, -4, 0, 4, 2, 0, -8, 0, 0, 0, 0, 2, 8, -4, 0, 6, 0, -4, 0, 0, 4, 0, -4, 4, 0, 0, 0, 4, 2, -2, -8, 0, 0, -8, 0, 0, 8, 0, -4, 0, 0, 0, 0, 2, 0, -8, -4, 4, 0, 0, 0, 6, 4, 0, -4, 4, 0, 0, 0, 0, 10, -4, -4, 0, 0, -4, 0, 4, 4, 0, 0, 0, 0, 0, 0, 4, 4, -2, -12, 2, 0, -8, 0]

cp's OEIS Frontend

A139093 Expansion of phi(q) * phi(-q^2) in powers of q where phi() is a Ramanujan theta function.

Table of values

List of values

n	a(n)
0	1
1	2
2	-2
3	-4
4	2
5	0
6	-4
7	0
8	2
9	6
10	0
11	-4
12	4
13	0
14	0
15	0
16	2
17	4
18	-6
19	-4
20	0
21	0
22	-4
23	0
24	4
25	2
26	0
27	-8
28	0
29	0
30	0
31	0
32	2
33	8
34	-4
35	0
36	6
37	0
38	-4
39	0
40	0
41	4
42	0
43	-4
44	4
45	0
46	0
47	0
48	4
49	2
50	-2
51	-8
52	0
53	0
54	-8
55	0
56	0
57	8
58	0
59	-4
60	0
61	0
62	0
63	0
64	2
65	0
66	-8
67	-4
68	4
69	0
70	0
71	0
72	6
73	4
74	0
75	-4
76	4
77	0
78	0
79	0
80	0
81	10
82	-4
83	-4
84	0
85	0
86	-4
87	0
88	4
89	4
90	0
91	0
92	0
93	0
94	0
95	0
96	4
97	4
98	-2
99	-12
100	2
101	0
102	-8
103	0

n	a(n)
0	1
1	2
2	-2
3	-4
4	2
5	0
6	-4
7	0
8	2
9	6
10	0
11	-4
12	4
13	0
14	0
15	0
16	2
17	4
18	-6
19	-4
20	0
21	0
22	-4
23	0
24	4
25	2
26	0
27	-8
28	0
29	0
30	0
31	0
32	2
33	8
34	-4
35	0
36	6
37	0
38	-4
39	0
40	0
41	4
42	0
43	-4
44	4
45	0
46	0
47	0
48	4
49	2
50	-2
51	-8
52	0
53	0
54	-8
55	0
56	0
57	8
58	0
59	-4
60	0
61	0
62	0
63	0
64	2
65	0
66	-8
67	-4
68	4
69	0
70	0
71	0
72	6
73	4
74	0
75	-4
76	4
77	0
78	0
79	0
80	0
81	10
82	-4
83	-4
84	0
85	0
86	-4
87	0
88	4
89	4
90	0
91	0
92	0
93	0
94	0
95	0
96	4
97	4
98	-2
99	-12
100	2
101	0
102	-8
103	0

n	a(n)
0	1
1	2
2	-2
3	-4
4	2
5	0
6	-4
7	0
8	2
9	6
10	0
11	-4
12	4
13	0
14	0
15	0
16	2
17	4
18	-6
19	-4
20	0
21	0
22	-4
23	0
24	4
25	2
26	0
27	-8
28	0
29	0
30	0
31	0
32	2
33	8
34	-4
35	0
36	6
37	0
38	-4
39	0
40	0
41	4
42	0
43	-4
44	4
45	0
46	0
47	0
48	4
49	2
50	-2
51	-8
52	0
53	0
54	-8
55	0
56	0
57	8
58	0
59	-4
60	0
61	0
62	0
63	0
64	2
65	0
66	-8
67	-4
68	4
69	0
70	0
71	0
72	6
73	4
74	0
75	-4
76	4
77	0
78	0
79	0
80	0
81	10
82	-4
83	-4
84	0
85	0
86	-4
87	0
88	4
89	4
90	0
91	0
92	0
93	0
94	0
95	0
96	4
97	4
98	-2
99	-12
100	2
101	0
102	-8
103	0