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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.

A118012 a(n) = 4*A117384(n) - n; a self-inverse permutation of the natural numbers.

Table of values

n a(n)
1 3
2 6
3 1
4 8
5 11
6 2
7 13
8 4
9 15
10 18
11 5
12 20
13 7
14 22
15 9
16 24
17 27
18 10
19 29
20 12
21 31
22 14
23 33
24 16
25 35
26 38
27 17
28 40
29 19
30 42
31 21
32 44
33 23
34 46
35 25
36 48
37 51
38 26
39 53
40 28
41 55
42 30
43 57
44 32
45 59
46 34
47 61
48 36
49 63
50 66
51 37
52 68
53 39
54 70
55 41
56 72
57 43
58 74
59 45
60 76
61 47
62 78
63 49
64 80
65 83
66 50
67 85
68 52
69 87
70 54
71 89
72 56

List of values

[3, 6, 1, 8, 11, 2, 13, 4, 15, 18, 5, 20, 7, 22, 9, 24, 27, 10, 29, 12, 31, 14, 33, 16, 35, 38, 17, 40, 19, 42, 21, 44, 23, 46, 25, 48, 51, 26, 53, 28, 55, 30, 57, 32, 59, 34, 61, 36, 63, 66, 37, 68, 39, 70, 41, 72, 43, 74, 45, 76, 47, 78, 49, 80, 83, 50, 85, 52, 87, 54, 89, 56]

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

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