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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.

A319243 Expansion of Product_{k>0} (1 - x^(k^2))/(1 + x^(k^2)).

Table of values

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

List of values

[1, -2, 2, -2, 0, 2, -2, 2, 0, -4, 6, -6, 4, 2, -6, 6, -6, 2, 4, -6, 8, -6, -2, 6, -8, 8, -2, -4, 8, -10, 6, 2, -6, 6, -2, -6, 8, -6, 2, 6, -8, 6, -2, -6, 8, -4, -2, 10, -14, 8, 0, -6, 16, -14, 4, 2, -16, 18, -2, -10, 24, -30, 14, 4, -20, 34, -26, 2, 16, -30, 26, 2, -20]

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