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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.

A055034 a(1) = 1, a(n) = phi(2*n)/2 for n > 1.

Table of values

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

List of values

[1, 1, 1, 2, 2, 2, 3, 4, 3, 4, 5, 4, 6, 6, 4, 8, 8, 6, 9, 8, 6, 10, 11, 8, 10, 12, 9, 12, 14, 8, 15, 16, 10, 16, 12, 12, 18, 18, 12, 16, 20, 12, 21, 20, 12, 22, 23, 16, 21, 20, 16, 24, 26, 18, 20, 24, 18, 28, 29, 16, 30, 30, 18, 32, 24, 20, 33, 32, 22, 24, 35, 24, 36, 36, 20, 36, 30]

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