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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.

A179211 Number of squarefree numbers between n and 2*n (inclusive).

Table of values

n a(n)
1 2
2 2
3 3
4 3
5 4
6 4
7 5
8 5
9 6
10 7
11 8
12 8
13 9
14 8
15 9
16 9
17 11
18 11
19 13
20 13
21 15
22 15
23 15
24 15
25 15
26 16
27 16
28 17
29 19
30 19
31 20
32 19
33 21
34 21
35 22
36 22
37 24
38 23
39 24
40 24
41 25
42 25
43 26
44 26
45 27
46 28
47 29
48 29
49 30
50 30
51 32
52 32
53 34
54 34
55 36
56 36
57 38
58 38
59 38
60 38
61 39
62 39
63 38
64 39
65 41
66 41
67 42
68 41
69 43
70 43
71 44
72 44
73 46
74 45
75 45

List of values

[2, 2, 3, 3, 4, 4, 5, 5, 6, 7, 8, 8, 9, 8, 9, 9, 11, 11, 13, 13, 15, 15, 15, 15, 15, 16, 16, 17, 19, 19, 20, 19, 21, 21, 22, 22, 24, 23, 24, 24, 25, 25, 26, 26, 27, 28, 29, 29, 30, 30, 32, 32, 34, 34, 36, 36, 38, 38, 38, 38, 39, 39, 38, 39, 41, 41, 42, 41, 43, 43, 44, 44, 46, 45, 45]

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