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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.

A378284 Unique sequence s starting with 1,2,1 such that if r(r(r(s) = s and r(s) != s and r(r(s) != s, where r(#) denotes the runlength sequence of a sequence #.

Table of values

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

List of values

[1, 2, 1, 1, 2, 1, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 1, 1, 2, 2, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 2, 1, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 1, 2, 1, 2, 2, 1, 2, 1, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 1, 2]

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