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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.

A258322 Expansion of phi(-q) * phi(-q^9) in powers of q where phi() is a Ramanujan theta function.

Table of values

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

List of values

[1, -2, 0, 0, 2, 0, 0, 0, 0, -4, 4, 0, 0, -4, 0, 0, 2, 0, 4, 0, 0, 0, 0, 0, 0, -6, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 4, -4, 0, 0, 4, 0, 0, 0, 0, -8, 0, 0, 0, -2, 0, 0, 4, 0, 0, 0, 0, 0, 4, 0, 0, -4, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 4, -4, 0, 0, 0, 0, 0, 0, 0, -4, 4]

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