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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.

A275966 a(n) is the real part of -I*Sum_{d|n}(mobius(d)*I^(n/d)), I=sqrt(-1), mobius(n) is A008683.

Table of values

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

List of values

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

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