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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.

A107130 Replace each odd digit d of n with (d-1)/2.

Table of values

n a(n)
0 0
1 0
2 2
3 1
4 4
5 2
6 6
7 3
8 8
9 4
10 0
11 0
12 2
13 1
14 4
15 2
16 6
17 3
18 8
19 4
20 20
21 20
22 22
23 21
24 24
25 22
26 26
27 23
28 28
29 24
30 10
31 10
32 12
33 11
34 14
35 12
36 16
37 13
38 18
39 14
40 40
41 40
42 42
43 41
44 44
45 42
46 46
47 43
48 48
49 44
50 20
51 20
52 22
53 21
54 24
55 22
56 26
57 23
58 28
59 24
60 60
61 60
62 62
63 61
64 64
65 62
66 66
67 63
68 68
69 64
70 30
71 30
72 32
73 31
74 34
75 32

List of values

[0, 0, 2, 1, 4, 2, 6, 3, 8, 4, 0, 0, 2, 1, 4, 2, 6, 3, 8, 4, 20, 20, 22, 21, 24, 22, 26, 23, 28, 24, 10, 10, 12, 11, 14, 12, 16, 13, 18, 14, 40, 40, 42, 41, 44, 42, 46, 43, 48, 44, 20, 20, 22, 21, 24, 22, 26, 23, 28, 24, 60, 60, 62, 61, 64, 62, 66, 63, 68, 64, 30, 30, 32, 31, 34, 32]

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