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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.

A335057 a(n) is the number of regions inside an n-gon formed by the straight line segments connecting vertex k to vertex 2k mod n.

Table of values

n a(n)
3 1
4 2
5 4
6 4
7 9
8 10
9 11
10 16
11 24
12 20
13 34
14 34
15 37
16 46
17 59
18 50
19 74
20 74
21 78
22 90
23 109
24 96
25 129
26 128
27 134
28 150
29 174
30 152
31 199
32 198
33 205
34 224
35 254
36 232
37 284
38 282
39 291
40 314
41 349
42 322
43 384
44 382
45 392
46 418
47 459
48 428
49 499
50 496
51 508
52 538
53 584
54 548
55 629
56 626
57 639
58 672
59 724

List of values

[1, 2, 4, 4, 9, 10, 11, 16, 24, 20, 34, 34, 37, 46, 59, 50, 74, 74, 78, 90, 109, 96, 129, 128, 134, 150, 174, 152, 199, 198, 205, 224, 254, 232, 284, 282, 291, 314, 349, 322, 384, 382, 392, 418, 459, 428, 499, 496, 508, 538, 584, 548, 629, 626, 639, 672, 724]

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

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