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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.

A116551 Permutation of natural numbers generated by 3-rowed array shown below.

Table of values

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

List of values

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