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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A260309 Expansion of phi(q) * phi(-q^6) in powers of q where phi() is a Ramanujan theta function.

Table of values

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

List of values

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

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