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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.

A004520 Generalized nim sum n + n in base 10.

Table of values

n a(n)
0 0
1 2
2 4
3 6
4 8
5 0
6 2
7 4
8 6
9 8
10 20
11 22
12 24
13 26
14 28
15 20
16 22
17 24
18 26
19 28
20 40
21 42
22 44
23 46
24 48
25 40
26 42
27 44
28 46
29 48
30 60
31 62
32 64
33 66
34 68
35 60
36 62
37 64
38 66
39 68
40 80
41 82
42 84
43 86
44 88
45 80
46 82
47 84
48 86
49 88
50 0
51 2
52 4
53 6
54 8
55 0
56 2
57 4
58 6
59 8
60 20
61 22
62 24
63 26
64 28
65 20
66 22
67 24
68 26
69 28
70 40
71 42
72 44
73 46
74 48
75 40
76 42

List of values

[0, 2, 4, 6, 8, 0, 2, 4, 6, 8, 20, 22, 24, 26, 28, 20, 22, 24, 26, 28, 40, 42, 44, 46, 48, 40, 42, 44, 46, 48, 60, 62, 64, 66, 68, 60, 62, 64, 66, 68, 80, 82, 84, 86, 88, 80, 82, 84, 86, 88, 0, 2, 4, 6, 8, 0, 2, 4, 6, 8, 20, 22, 24, 26, 28, 20, 22, 24, 26, 28, 40, 42, 44, 46, 48, 40, 42]

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