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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.

A243747 Expansion of (phi(q) - phi(q^2))^2 / 4 in powers of q where phi() is a Ramanujan theta function.

Table of values

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

List of values

[1, -2, 1, 2, -2, 0, 1, -2, 4, -2, -2, 2, 0, 0, 1, 0, -1, -2, 4, 0, -2, 0, -2, 2, 4, -4, 0, 2, 0, 0, 1, -4, 2, 0, -1, 2, -2, 0, 4, 0, 0, -2, -2, 2, 0, 0, -2, 0, 5, -4, 4, 2, -4, 0, 0, -4, 4, -2, 0, 2, 0, 0, 1, 4, -4, -2, 2, 0, 0, 0, -1, 0, 4, -2, -2, 0, 0, 0]

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