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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.

A061800 a(n) = n + (-1)^(n mod 3).

Table of values

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

List of values

[1, 0, 3, 4, 3, 6, 7, 6, 9, 10, 9, 12, 13, 12, 15, 16, 15, 18, 19, 18, 21, 22, 21, 24, 25, 24, 27, 28, 27, 30, 31, 30, 33, 34, 33, 36, 37, 36, 39, 40, 39, 42, 43, 42, 45, 46, 45, 48, 49, 48, 51, 52, 51, 54, 55, 54, 57, 58, 57, 60, 61, 60, 63, 64, 63, 66, 67, 66, 69, 70, 69, 72]

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