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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.

A138949 Expansion of (3 * phi(q^3)^2 - phi(q)^2) / 2 in powers of q where phi() is a Ramanujan theta function.

Table of values

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

List of values

[1, -2, -2, 6, -2, -4, 6, 0, -2, -2, -4, 0, 6, -4, 0, 12, -2, -4, -2, 0, -4, 0, 0, 0, 6, -6, -4, 6, 0, -4, 12, 0, -2, 0, -4, 0, -2, -4, 0, 12, -4, -4, 0, 0, 0, -4, 0, 0, 6, -2, -6, 12, -4, -4, 6, 0, 0, 0, -4, 0, 12, -4, 0, 0, -2, -8, 0, 0, -4, 0, 0, 0, -2, -4]

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