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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.

A309563 Cyclic permutations of length n that avoid the patterns 123 and 231.

Table of values

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

List of values

[1, 1, 1, 1, 2, 3, 2, 2, 4, 6, 2, 2, 6, 8, 4, 4, 6, 10, 4, 4, 10, 12, 4, 4, 12, 18, 6, 6, 8, 12, 8, 8, 16, 22, 6, 6, 18, 22, 8, 8, 12, 22, 10, 10, 22, 26, 8, 8, 20, 32, 12, 12, 18, 24, 12, 12, 28, 36, 8, 8, 30, 38, 16, 16, 20, 36, 16, 16, 24, 30, 12, 12, 36, 54]

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