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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.

A122860 Expansion of (1 - phi(-q)^3 / phi(-q^3)) / 6 in powers of q where phi() is a Ramanujan theta function.

Table of values

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

List of values

[1, -2, 1, 1, 0, -2, 2, -2, 1, 0, 0, 1, 2, -4, 0, 1, 0, -2, 2, 0, 2, 0, 0, -2, 1, -4, 1, 2, 0, 0, 2, -2, 0, 0, 0, 1, 2, -4, 2, 0, 0, -4, 2, 0, 0, 0, 0, 1, 3, -2, 0, 2, 0, -2, 0, -4, 2, 0, 0, 0, 2, -4, 2, 1, 0, 0, 2, 0, 0, 0, 0, -2, 2, -4, 1, 2, 0, -4, 2, 0, 1]

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