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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.

A338041 Draw n rays from each of two distinct points in the plane; a(n) is the number of regions thus created. See Comments for details.

Table of values

n a(n)
1 1
2 2
3 7
4 6
5 15
6 12
7 25
8 20
9 37
10 30
11 51
12 42
13 67
14 56
15 85
16 72
17 105
18 90
19 127
20 110
21 151
22 132
23 177
24 156
25 205
26 182
27 235
28 210
29 267
30 240
31 301
32 272
33 337
34 306
35 375
36 342
37 415
38 380
39 457
40 420
41 501
42 462
43 547
44 506
45 595
46 552
47 645
48 600
49 697
50 650
51 751
52 702
53 807
54 756
55 865
56 812
57 925

List of values

[1, 2, 7, 6, 15, 12, 25, 20, 37, 30, 51, 42, 67, 56, 85, 72, 105, 90, 127, 110, 151, 132, 177, 156, 205, 182, 235, 210, 267, 240, 301, 272, 337, 306, 375, 342, 415, 380, 457, 420, 501, 462, 547, 506, 595, 552, 645, 600, 697, 650, 751, 702, 807, 756, 865, 812, 925]

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

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