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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.

A374828 Irregular table read by rows: Place n equally spaced points on the circumference of a circle of radius r and then connect each pair of points with straight lines whose intersections create A007569(n) - n additional points. Draw a circle of radius r around each of the A007569(n) points. T(n,k) is the number of k-sided regions, k>=2, formed from all circle intersections.

Table of values

n a(n)
3 3
4 3
5 0
6 12
7 4
8 5
9 45
10 10
11 10
12 10
13 0
14 156
15 84
16 48
17 30
18 6
19 0
20 742
21 476
22 294
23 119
24 21
25 14
26 0
27 1104
28 1296
29 512
30 152
31 40
32 16
33 0
34 6669
35 6768
36 2790
37 1179
38 207
39 81
40 9
41 0
42 10280
43 11130
44 5490
45 1440
46 260
47 150
48 20
49 10
50 0
51 40777
52 45342
53 20669
54 6963
55 1177
56 374
57 77
58 11
59 11

List of values

[3, 3, 0, 12, 4, 5, 45, 10, 10, 10, 0, 156, 84, 48, 30, 6, 0, 742, 476, 294, 119, 21, 14, 0, 1104, 1296, 512, 152, 40, 16, 0, 6669, 6768, 2790, 1179, 207, 81, 9, 0, 10280, 11130, 5490, 1440, 260, 150, 20, 10, 0, 40777, 45342, 20669, 6963, 1177, 374, 77, 11, 11]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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