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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.

A178042 Consider the weighted Farey tree A177405/A177407; a(n) = row at which the denominator 2n+1 first appears (assumes first row is labeled row 1).

Table of values

n a(n)
0 1
1 2
2 3
3 3
4 3
5 4
6 4
7 5
8 4
9 4
10 5
11 5
12 5
13 4
14 5
15 5
16 6
17 6
18 6
19 6
20 5
21 5
22 6
23 5
24 6
25 7
26 5
27 5
28 7
29 6
30 7
31 6
32 6
33 6
34 6
35 6
36 6
37 6
38 6
39 6
40 5
41 6
42 7
43 8
44 7
45 7
46 7
47 7
48 7
49 6
50 7
51 6
52 7
53 7
54 7
55 7
56 6
57 7
58 8
59 7
60 7
61 7
62 7
63 7
64 7
65 7
66 6
67 7
68 6
69 8
70 8
71 7
72 7
73 8
74 8
75 7
76 8
77 7
78 7
79 7
80 6
81 6
82 8
83 7
84 7
85 7
86 8
87 8
88 8
89 7
90 7
91 7
92 8
93 8
94 7
95 8
96 8
97 8
98 7
99 8
100 8

List of values

[1, 2, 3, 3, 3, 4, 4, 5, 4, 4, 5, 5, 5, 4, 5, 5, 6, 6, 6, 6, 5, 5, 6, 5, 6, 7, 5, 5, 7, 6, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 6, 7, 8, 7, 7, 7, 7, 7, 6, 7, 6, 7, 7, 7, 7, 6, 7, 8, 7, 7, 7, 7, 7, 7, 7, 6, 7, 6, 8, 8, 7, 7, 8, 8, 7, 8, 7, 7, 7, 6, 6, 8, 7, 7, 7, 8, 8, 8, 7, 7, 7, 8, 8, 7, 8, 8, 8, 7, 8, 8]

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