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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.

A287571 Start with 0 and repeatedly substitute 0->0312, 1->3120, 2->1203, 3->2031.

Table of values

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

List of values

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

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