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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.

A194222 a(n) = floor(Sum_{k=1..n} frac(k/5)), where frac() = fractional part.

Table of values

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

List of values

[0, 0, 1, 2, 2, 2, 2, 3, 4, 4, 4, 4, 5, 6, 6, 6, 6, 7, 8, 8, 8, 8, 9, 10, 10, 10, 10, 11, 12, 12, 12, 12, 13, 14, 14, 14, 14, 15, 16, 16, 16, 16, 17, 18, 18, 18, 18, 19, 20, 20, 20, 20, 21, 22, 22, 22, 22, 23, 24, 24, 24, 24, 25, 26, 26, 26, 26, 27, 28, 28, 28, 28, 29, 30]

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