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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.

A248360 a(n) = floor( 1/(1 - cos(Pi/n)) ).

Table of values

n a(n)
1 0
2 1
3 2
4 3
5 5
6 7
7 10
8 13
9 16
10 20
11 24
12 29
13 34
14 39
15 45
16 52
17 58
18 65
19 73
20 81
21 89
22 98
23 107
24 116
25 126
26 137
27 147
28 159
29 170
30 182
31 194
32 207
33 220
34 234
35 248
36 262
37 277
38 292
39 308
40 324
41 340
42 357
43 374
44 392
45 410
46 428
47 447
48 467
49 486
50 506
51 527
52 548
53 569
54 591
55 613
56 635
57 658

List of values

[0, 1, 2, 3, 5, 7, 10, 13, 16, 20, 24, 29, 34, 39, 45, 52, 58, 65, 73, 81, 89, 98, 107, 116, 126, 137, 147, 159, 170, 182, 194, 207, 220, 234, 248, 262, 277, 292, 308, 324, 340, 357, 374, 392, 410, 428, 447, 467, 486, 506, 527, 548, 569, 591, 613, 635, 658]