cp's OEIS Frontend

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.

A187263 Number of nonempty subsets of {1, 2, ..., n} with <=2 pairwise coprime elements.

Table of values

n a(n)
1 1
2 3
3 6
4 9
5 14
6 17
7 24
8 29
9 36
10 41
11 52
12 57
13 70
14 77
15 86
16 95
17 112
18 119
19 138
20 147
21 160
22 171
23 194
24 203
25 224
26 237
27 256
28 269
29 298
30 307
31 338
32 355
33 376
34 393
35 418
36 431
37 468
38 487
39 512
40 529
41 570
42 583
43 626
44 647
45 672
46 695
47 742
48 759
49 802
50 823

List of values

[1, 3, 6, 9, 14, 17, 24, 29, 36, 41, 52, 57, 70, 77, 86, 95, 112, 119, 138, 147, 160, 171, 194, 203, 224, 237, 256, 269, 298, 307, 338, 355, 376, 393, 418, 431, 468, 487, 512, 529, 570, 583, 626, 647, 672, 695, 742, 759, 802, 823]