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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.

A347030 a(n) = 1 + Sum_{k=2..n} (-1)^k * a(floor(n/k)).

Table of values

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

List of values

[1, 2, 1, 3, 2, 1, 0, 4, 4, 3, 2, 0, -1, -2, -1, 7, 6, 6, 5, 3, 4, 3, 2, -2, -2, -3, -3, -5, -6, -5, -6, 10, 11, 10, 11, 11, 10, 9, 10, 6, 5, 6, 5, 3, 3, 2, 1, -7, -7, -7, -6, -8, -9, -9, -8, -12, -11, -12, -13, -11, -12, -13, -13, 19, 20, 21, 20, 18, 19, 20, 19, 19, 18, 17, 17]

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