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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.

A286716 a(n) = floor(n/2) - floor((n+1)/5), n >= 0.

Table of values

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

List of values

[0, 0, 1, 1, 1, 1, 2, 2, 3, 2, 3, 3, 4, 4, 4, 4, 5, 5, 6, 5, 6, 6, 7, 7, 7, 7, 8, 8, 9, 8, 9, 9, 10, 10, 10, 10, 11, 11, 12, 11, 12, 12, 13, 13, 13, 13, 14, 14, 15, 14, 15, 15, 16, 16, 16, 16, 17, 17, 18, 17, 18, 18, 19, 19, 19, 19, 20, 20, 21, 20, 21, 21, 22]

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