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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.

A239913 a(n) = n - Q(n), where Q(n) is Hofstadter's Q-sequence A005185.

Table of values

n a(n)
1 0
2 1
3 1
4 1
5 2
6 2
7 2
8 3
9 3
10 4
11 5
12 4
13 5
14 6
15 5
16 7
17 7
18 7
19 8
20 8
21 9
22 10
23 11
24 8
25 11
26 12
27 11
28 12
29 13
30 14
31 11
32 15
33 16
34 14
35 14
36 17
37 17
38 16
39 18
40 18
41 18
42 19
43 19
44 20
45 21
46 22
47 23
48 16
49 25
50 25
51 21
52 24
53 27
54 24
55 25
56 28
57 25
58 28
59 27
60 28
61 29
62 30
63 23
64 31
65 34
66 28
67 32
68 35
69 30
70 30
71 34
72 34
73 33
74 35

List of values

[0, 1, 1, 1, 2, 2, 2, 3, 3, 4, 5, 4, 5, 6, 5, 7, 7, 7, 8, 8, 9, 10, 11, 8, 11, 12, 11, 12, 13, 14, 11, 15, 16, 14, 14, 17, 17, 16, 18, 18, 18, 19, 19, 20, 21, 22, 23, 16, 25, 25, 21, 24, 27, 24, 25, 28, 25, 28, 27, 28, 29, 30, 23, 31, 34, 28, 32, 35, 30, 30, 34, 34, 33, 35]

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