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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.

A359116 Mark the points of the Farey series F_n on a strip of paper and wrap it around a circle of circumference 1 so the endpoints 0 and 1 coincide; draw a chord between every pair of the Farey points; a(n) is the number of vertices in the resulting graph.

Table of values

n a(n)
1 1
2 2
3 5
4 19
5 208
6 480
7 3011
8 7185
9 20169
10 35438
11 111232
12 162062
13 422841
14 633226
15 1024370
16 1576122
17 3315790
18 4240974
19 8204951
20 10654475
21 15310713

List of values

[1, 2, 5, 19, 208, 480, 3011, 7185, 20169, 35438, 111232, 162062, 422841, 633226, 1024370, 1576122, 3315790, 4240974, 8204951, 10654475, 15310713]

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

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