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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.

A373924 a(n) = Sum_{d|n} (-1)^pi(d) * mu(n/d).

Table of values

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

List of values

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

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