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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.

A381331 a(1) = a(2) = 1; for n > 2, a(n) = floor((n - 2)*a(n - 1)/a(n - 2)) + GCD(n - 2, a(n - 2)).

Table of values

n a(n)
1 1
2 1
3 2
4 5
5 8
6 7
7 5
8 5
9 8
10 13
11 15
12 12
13 9
14 21
15 31
16 27
17 14
18 9
19 11
20 31
21 54
22 35
23 16
24 11
25 16
26 35
27 55
28 41
29 21
30 15
31 21
32 57
33 85
34 48
35 19
36 15
37 28
38 70
39 93
40 52
41 24
42 22
43 38
44 74
45 84
46 51
47 30
48 28
49 44
50 79
51 88
52 56
53 33
54 34
55 55
56 89
57 144
58 91
59 39
60 25
61 38
62 96
63 155
64 102
65 42
66 28
67 44
68 105
69 160
70 104

List of values

[1, 1, 2, 5, 8, 7, 5, 5, 8, 13, 15, 12, 9, 21, 31, 27, 14, 9, 11, 31, 54, 35, 16, 11, 16, 35, 55, 41, 21, 15, 21, 57, 85, 48, 19, 15, 28, 70, 93, 52, 24, 22, 38, 74, 84, 51, 30, 28, 44, 79, 88, 56, 33, 34, 55, 89, 144, 91, 39, 25, 38, 96, 155, 102, 42, 28, 44, 105, 160, 104]

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