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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.

A265262 The tree of hemitropic sequences read by rows, arising from an Erdős-Turán conjecture.

Table of values

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

List of values

[1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 2, 1, 2, 2, 3, 0, 1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 2, 1, 2, 2, 3, 0, 1, 1, 2, 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 0, 1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 2, 0, 1, 1, 2]

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