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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.

A131380 a(3n) = 2n, a(3n+1) = 2n+2, a(3n+2) = 2n+1.

Table of values

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

List of values

[0, 2, 1, 2, 4, 3, 4, 6, 5, 6, 8, 7, 8, 10, 9, 10, 12, 11, 12, 14, 13, 14, 16, 15, 16, 18, 17, 18, 20, 19, 20, 22, 21, 22, 24, 23, 24, 26, 25, 26, 28, 27, 28, 30, 29, 30, 32, 31, 32, 34, 33, 34, 36, 35, 36, 38, 37, 38, 40, 39, 40, 42, 41, 42, 44, 43, 44, 46, 45, 46, 48, 47, 48, 50]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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