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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.

A364558 a(n) = A364557(n) - A000010(n), where A364557 is the Möbius transform of A005941, and A000010 (Euler phi) is the Möbius transform of A000027.

Table of values

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 2
8 0
9 -2
10 0
11 6
12 0
13 20
14 2
15 -4
16 0
17 48
18 -2
19 110
20 0
21 -4
22 6
23 234
24 0
25 -12
26 20
27 -10
28 4
29 484
30 -4
31 994
32 0
33 -4
34 48
35 -16
36 -4
37 2012
38 110
39 8
40 0
41 4056
42 -4
43 8150
44 12
45 -16
46 234
47 16338
48 0
49 -26
50 -12
51 32
52 40
53 32716
54 -10
55 -24
56 8
57 92
58 484
59 65478
60 -8
61 131012
62 994
63 -20
64 0
65 -16
66 -4
67 262078
68 96
69 212
70 -16
71 524218
72 -8
73 1048504

List of values

[0, 0, 0, 0, 0, 0, 2, 0, -2, 0, 6, 0, 20, 2, -4, 0, 48, -2, 110, 0, -4, 6, 234, 0, -12, 20, -10, 4, 484, -4, 994, 0, -4, 48, -16, -4, 2012, 110, 8, 0, 4056, -4, 8150, 12, -16, 234, 16338, 0, -26, -12, 32, 40, 32716, -10, -24, 8, 92, 484, 65478, -8, 131012, 994, -20, 0, -16, -4, 262078, 96, 212, -16, 524218, -8, 1048504]

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