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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.

A265888 a(n) = n + floor(n/4)*(-1)^(n mod 4).

Table of values

n a(n)
0 0
1 1
2 2
3 3
4 5
5 4
6 7
7 6
8 10
9 7
10 12
11 9
12 15
13 10
14 17
15 12
16 20
17 13
18 22
19 15
20 25
21 16
22 27
23 18
24 30
25 19
26 32
27 21
28 35
29 22
30 37
31 24
32 40
33 25
34 42
35 27
36 45
37 28
38 47
39 30
40 50
41 31
42 52
43 33
44 55
45 34
46 57
47 36
48 60
49 37
50 62
51 39
52 65
53 40
54 67
55 42
56 70
57 43
58 72
59 45
60 75
61 46
62 77
63 48
64 80
65 49
66 82
67 51
68 85
69 52
70 87

List of values

[0, 1, 2, 3, 5, 4, 7, 6, 10, 7, 12, 9, 15, 10, 17, 12, 20, 13, 22, 15, 25, 16, 27, 18, 30, 19, 32, 21, 35, 22, 37, 24, 40, 25, 42, 27, 45, 28, 47, 30, 50, 31, 52, 33, 55, 34, 57, 36, 60, 37, 62, 39, 65, 40, 67, 42, 70, 43, 72, 45, 75, 46, 77, 48, 80, 49, 82, 51, 85, 52, 87]

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

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