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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.

A246816 Expansion of phi(q) * phi(-q^2) * phi(-q^4) in powers of q where phi() is a Ramanujan theta function.

Table of values

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

List of values

[1, 2, -2, -4, 0, -4, 0, 8, -2, 6, 8, -4, 0, -12, 0, 8, -4, 8, -10, -12, 0, -8, 0, 8, 8, 14, 8, -16, 0, -4, 0, 16, 6, 16, -16, -8, 0, -20, 0, 8, -8, 8, 16, -20, 0, -20, 0, 16, -8, 18, -10, -8, 0, -12, 0, 24, 0, 16, 24, -12, 0, -20, 0, 24, 12, 8, -16, -28, 0]

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