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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.

A378304 Unique sequence s starting with 1,1,2,2 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 1
3 2
4 2
5 1
6 2
7 2
8 1
9 1
10 2
11 1
12 2
13 2
14 1
15 2
16 2
17 1
18 1
19 2
20 1
21 1
22 2
23 1
24 2
25 2
26 1
27 1
28 2
29 1
30 1
31 2
32 2
33 1
34 2
35 2
36 1
37 2
38 1
39 1
40 2
41 1
42 1
43 2
44 2
45 1
46 2
47 1
48 1
49 2
50 1
51 2
52 2
53 1
54 1
55 2
56 1
57 1
58 2
59 1
60 2
61 2
62 1
63 2
64 1
65 1
66 2
67 2
68 1
69 2
70 2
71 1
72 1
73 2
74 1
75 1
76 2
77 1
78 2
79 2
80 1
81 2
82 2
83 1
84 1
85 2
86 1

List of values

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

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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