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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.

A257845 a(n) = floor(n/5) * (n mod 5).

Table of values

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

List of values

[0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 0, 2, 4, 6, 8, 0, 3, 6, 9, 12, 0, 4, 8, 12, 16, 0, 5, 10, 15, 20, 0, 6, 12, 18, 24, 0, 7, 14, 21, 28, 0, 8, 16, 24, 32, 0, 9, 18, 27, 36, 0, 10, 20, 30, 40, 0, 11, 22, 33, 44, 0, 12, 24, 36, 48, 0, 13, 26, 39, 52, 0, 14, 28, 42, 56]

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