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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.

A237420 If n is odd, then a(n) = 0; otherwise, a(n) = n.

Table of values

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

List of values

[0, 0, 2, 0, 4, 0, 6, 0, 8, 0, 10, 0, 12, 0, 14, 0, 16, 0, 18, 0, 20, 0, 22, 0, 24, 0, 26, 0, 28, 0, 30, 0, 32, 0, 34, 0, 36, 0, 38, 0, 40, 0, 42, 0, 44, 0, 46, 0, 48, 0, 50, 0, 52, 0, 54, 0, 56, 0, 58, 0, 60, 0, 62, 0, 64, 0, 66, 0, 68, 0, 70, 0, 72, 0, 74]

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