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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.

A069470 a(n) = Sum_{k>=1} floor(n/(k*(k+1)/2)).

Table of values

n a(n)
0 0
1 1
2 2
3 4
4 5
5 6
6 9
7 10
8 11
9 13
10 15
11 16
12 19
13 20
14 21
15 24
16 25
17 26
18 29
19 30
20 32
21 35
22 36
23 37
24 40
25 41
26 42
27 44
28 46
29 47
30 52
31 53
32 54
33 56
34 57
35 58
36 62
37 63
38 64
39 66
40 68
41 69
42 73
43 74
44 75
45 79
46 80
47 81
48 84
49 85
50 87
51 89
52 90
53 91
54 94
55 96
56 98
57 100
58 101
59 102
60 107
61 108
62 109
63 112
64 113
65 114
66 118

List of values

[0, 1, 2, 4, 5, 6, 9, 10, 11, 13, 15, 16, 19, 20, 21, 24, 25, 26, 29, 30, 32, 35, 36, 37, 40, 41, 42, 44, 46, 47, 52, 53, 54, 56, 57, 58, 62, 63, 64, 66, 68, 69, 73, 74, 75, 79, 80, 81, 84, 85, 87, 89, 90, 91, 94, 96, 98, 100, 101, 102, 107, 108, 109, 112, 113, 114, 118]