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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.

A257844 a(n) = floor(n/4) * (n mod 4).

Table of values

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

List of values

[0, 0, 0, 0, 0, 1, 2, 3, 0, 2, 4, 6, 0, 3, 6, 9, 0, 4, 8, 12, 0, 5, 10, 15, 0, 6, 12, 18, 0, 7, 14, 21, 0, 8, 16, 24, 0, 9, 18, 27, 0, 10, 20, 30, 0, 11, 22, 33, 0, 12, 24, 36, 0, 13, 26, 39, 0, 14, 28, 42, 0, 15, 30, 45, 0, 16, 32, 48, 0, 17, 34, 51, 0, 18, 36]

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