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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.

A077591 Maximum number of regions into which the plane can be divided using n (concave) quadrilaterals.

Table of values

n a(n)
0 1
1 2
2 18
3 50
4 98
5 162
6 242
7 338
8 450
9 578
10 722
11 882
12 1058
13 1250
14 1458
15 1682
16 1922
17 2178
18 2450
19 2738
20 3042
21 3362
22 3698
23 4050
24 4418
25 4802
26 5202
27 5618
28 6050
29 6498
30 6962
31 7442
32 7938
33 8450
34 8978
35 9522
36 10082
37 10658
38 11250
39 11858
40 12482
41 13122
42 13778

List of values

[1, 2, 18, 50, 98, 162, 242, 338, 450, 578, 722, 882, 1058, 1250, 1458, 1682, 1922, 2178, 2450, 2738, 3042, 3362, 3698, 4050, 4418, 4802, 5202, 5618, 6050, 6498, 6962, 7442, 7938, 8450, 8978, 9522, 10082, 10658, 11250, 11858, 12482, 13122, 13778]

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

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