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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.

A265734 Permutation of nonnegative integers: a(n) = n + floor(n/5)*(-1)^(n mod 5).

Table of values

n a(n)
0 0
1 1
2 2
3 3
4 4
5 6
6 5
7 8
8 7
9 10
10 12
11 9
12 14
13 11
14 16
15 18
16 13
17 20
18 15
19 22
20 24
21 17
22 26
23 19
24 28
25 30
26 21
27 32
28 23
29 34
30 36
31 25
32 38
33 27
34 40
35 42
36 29
37 44
38 31
39 46
40 48
41 33
42 50
43 35
44 52
45 54
46 37
47 56
48 39
49 58
50 60
51 41
52 62
53 43
54 64
55 66
56 45
57 68
58 47
59 70
60 72
61 49
62 74
63 51
64 76
65 78
66 53
67 80

List of values

[0, 1, 2, 3, 4, 6, 5, 8, 7, 10, 12, 9, 14, 11, 16, 18, 13, 20, 15, 22, 24, 17, 26, 19, 28, 30, 21, 32, 23, 34, 36, 25, 38, 27, 40, 42, 29, 44, 31, 46, 48, 33, 50, 35, 52, 54, 37, 56, 39, 58, 60, 41, 62, 43, 64, 66, 45, 68, 47, 70, 72, 49, 74, 51, 76, 78, 53, 80]

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

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