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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.

A359478 a(1) = 1; a(n) = -Sum_{k=2..n} k * a(floor(n/k)).

Table of values

n a(n)
1 1
2 -2
3 -5
4 -3
5 -8
6 1
7 -6
8 -6
9 -6
10 9
11 -2
12 -8
13 -21
14 0
15 15
16 15
17 -2
18 -2
19 -21
20 -31
21 -10
22 23
23 0
24 0
25 0
26 39
27 39
28 25
29 -4
30 -49
31 -80
32 -80
33 -47
34 4
35 39
36 39
37 2
38 59
39 98
40 98
41 57
42 -6
43 -49
44 -71
45 -71
46 -2
47 -49
48 -49
49 -49
50 -49
51 2
52 -24
53 -77
54 -77
55 -22
56 -22
57 35
58 122
59 63
60 93
61 32
62 125
63 125
64 125
65 190
66 91

List of values

[1, -2, -5, -3, -8, 1, -6, -6, -6, 9, -2, -8, -21, 0, 15, 15, -2, -2, -21, -31, -10, 23, 0, 0, 0, 39, 39, 25, -4, -49, -80, -80, -47, 4, 39, 39, 2, 59, 98, 98, 57, -6, -49, -71, -71, -2, -49, -49, -49, -49, 2, -24, -77, -77, -22, -22, 35, 122, 63, 93, 32, 125, 125, 125, 190, 91]

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