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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.

A317528 Expansion of Sum_{k>=1} mu(k)^2*x^k/(1 + x^k), where mu() is the Moebius function (A008683).

Table of values

n a(n)
1 1
2 0
3 2
4 -2
5 2
6 0
7 2
8 -2
9 2
10 0
11 2
12 -4
13 2
14 0
15 4
16 -2
17 2
18 0
19 2
20 -4
21 4
22 0
23 2
24 -4
25 2
26 0
27 2
28 -4
29 2
30 0
31 2
32 -2
33 4
34 0
35 4
36 -4
37 2
38 0
39 4
40 -4
41 2
42 0
43 2
44 -4
45 4
46 0
47 2
48 -4
49 2
50 0
51 4
52 -4
53 2
54 0
55 4
56 -4
57 4
58 0
59 2
60 -8
61 2
62 0
63 4
64 -2
65 4
66 0
67 2
68 -4
69 4
70 0
71 2
72 -4
73 2
74 0
75 4
76 -4
77 4
78 0
79 2
80 -4
81 2
82 0
83 2
84 -8
85 4
86 0
87 4
88 -4
89 2
90 0
91 4
92 -4
93 4
94 0
95 4

List of values

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