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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.

A378285 Unique sequence s starting with 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 2
2 1
3 1
4 2
5 1
6 2
7 2
8 1
9 2
10 1
11 1
12 2
13 2
14 1
15 2
16 2
17 1
18 1
19 2
20 1
21 2
22 2
23 1
24 2
25 2
26 1
27 1
28 2
29 1
30 1
31 2
32 1
33 2
34 2
35 1
36 2
37 1
38 1
39 2
40 2
41 1
42 2
43 2
44 1
45 2
46 1
47 1
48 2
49 1
50 1
51 2
52 2
53 1
54 2
55 1
56 1
57 2
58 1
59 2
60 2
61 1
62 2
63 2
64 1
65 1
66 2
67 1
68 1
69 2
70 1
71 2
72 2
73 1
74 1
75 2
76 1
77 1
78 2
79 2
80 1
81 2
82 1
83 1
84 2
85 1
86 1

List of values

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

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