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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.

A187333 a(n) = floor(n/5) + floor(2n/5) + floor(3n/5) + floor(4n/5).

Table of values

n a(n)
0 0
1 0
2 2
3 4
4 6
5 10
6 10
7 12
8 14
9 16
10 20
11 20
12 22
13 24
14 26
15 30
16 30
17 32
18 34
19 36
20 40
21 40
22 42
23 44
24 46
25 50
26 50
27 52
28 54
29 56
30 60
31 60
32 62
33 64
34 66
35 70
36 70
37 72
38 74
39 76
40 80
41 80
42 82
43 84
44 86
45 90
46 90
47 92
48 94
49 96
50 100
51 100
52 102
53 104
54 106
55 110
56 110
57 112
58 114
59 116
60 120
61 120
62 122
63 124
64 126
65 130
66 130
67 132
68 134
69 136
70 140
71 140
72 142
73 144
74 146
75 150

List of values

[0, 0, 2, 4, 6, 10, 10, 12, 14, 16, 20, 20, 22, 24, 26, 30, 30, 32, 34, 36, 40, 40, 42, 44, 46, 50, 50, 52, 54, 56, 60, 60, 62, 64, 66, 70, 70, 72, 74, 76, 80, 80, 82, 84, 86, 90, 90, 92, 94, 96, 100, 100, 102, 104, 106, 110, 110, 112, 114, 116, 120, 120, 122, 124, 126, 130, 130, 132, 134, 136, 140, 140, 142, 144, 146, 150]

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