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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.

A178031 Consider the Farey tree A049455/A049456; a(n) = row at which the denominator n first appears (assumes first row is labeled row 1).

Table of values

n a(n)
1 1
2 2
3 3
4 4
5 4
6 6
7 5
8 5
9 6
10 6
11 6
12 6
13 6
14 7
15 7
16 7
17 7
18 7
19 7
20 8
21 7
22 8
23 8
24 8
25 8
26 8
27 8
28 9
29 8
30 8
31 8
32 9
33 9
34 8
35 9
36 9
37 9
38 10
39 9
40 9
41 9
42 10
43 9
44 9
45 9
46 9
47 9
48 10
49 9
50 9
51 10
52 10
53 10
54 11
55 9
56 10
57 10
58 10
59 10
60 10
61 10
62 10
63 10
64 10
65 10
66 10
67 10
68 10
69 10
70 10

List of values

[1, 2, 3, 4, 4, 6, 5, 5, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 8, 7, 8, 8, 8, 8, 8, 8, 9, 8, 8, 8, 9, 9, 8, 9, 9, 9, 10, 9, 9, 9, 10, 9, 9, 9, 9, 9, 10, 9, 9, 10, 10, 10, 11, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10]

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