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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.

A134015 Expansion of (1 - phi(-q) * phi(q^4)) / 2 in powers of q where phi() is a Ramanujan theta function.

Table of values

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

List of values

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

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