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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.

A195459 a(n) = phi(3*n)/2.

Table of values

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

List of values

[1, 1, 3, 2, 4, 3, 6, 4, 9, 4, 10, 6, 12, 6, 12, 8, 16, 9, 18, 8, 18, 10, 22, 12, 20, 12, 27, 12, 28, 12, 30, 16, 30, 16, 24, 18, 36, 18, 36, 16, 40, 18, 42, 20, 36, 22, 46, 24, 42, 20, 48, 24, 52, 27, 40, 24, 54, 28, 58, 24, 60, 30, 54, 32, 48, 30, 66, 32, 66, 24, 70, 36, 72, 36, 60, 36, 60, 36, 78, 32, 81, 40, 82]

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