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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.

A133693 Expansion of (1 - phi(-q) * phi(q^2)) / 2 in powers of q where phi() is a Ramanujan theta function.

Table of values

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

List of values

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

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