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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.

A264782 a(n) = Sum_{d|n} möbius(d)^(n/d).

Table of values

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

List of values

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

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