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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.

A133692 Expansion of phi(-q) * phi(q^2) in powers of q where phi() is a Ramanujan theta function.

Table 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

List of values

[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]

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