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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.

A070544 Number of squarefree numbers s such that n < s < 2n.

Table of values

n a(n)
1 0
2 1
3 1
4 3
5 2
6 3
7 3
8 5
9 6
10 6
11 6
12 8
13 7
14 7
15 7
16 9
17 9
18 11
19 11
20 13
21 13
22 14
23 13
24 15
25 15
26 15
27 16
28 17
29 17
30 18
31 18
32 19
33 19
34 20
35 20
36 22
37 22
38 22
39 22
40 24
41 23
42 24
43 24
44 26
45 27
46 27
47 27
48 29
49 30
50 30
51 30
52 32
53 32
54 34
55 34
56 36
57 36
58 37
59 36
60 38
61 37
62 38
63 38
64 39
65 39
66 40
67 40
68 41
69 41
70 42
71 42
72 44
73 44
74 44
75 45

List of values

[0, 1, 1, 3, 2, 3, 3, 5, 6, 6, 6, 8, 7, 7, 7, 9, 9, 11, 11, 13, 13, 14, 13, 15, 15, 15, 16, 17, 17, 18, 18, 19, 19, 20, 20, 22, 22, 22, 22, 24, 23, 24, 24, 26, 27, 27, 27, 29, 30, 30, 30, 32, 32, 34, 34, 36, 36, 37, 36, 38, 37, 38, 38, 39, 39, 40, 40, 41, 41, 42, 42, 44, 44, 44, 45]

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