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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.

A128581 Expansion of (phi(q^2) * phi(-q^3) - phi(-q) * phi(q^6)) / 2 in powers of q where phi() is a Ramanujan theta function.

Table of values

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

List of values

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

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