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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.

A138270 Expansion of phi(-q^3) * phi(-q^4) in powers of q where phi() is a Ramanujan theta function.

Table of values

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

List of values

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

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