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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.

A285582 a(1) = 1, a(2) = a(3) = a(4) = 2; a(n) = a(a(n-3)-1) + a(n-a(n-4)-1) for n > 4.

Table of values

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

List of values

[1, 2, 2, 2, 3, 3, 3, 5, 5, 5, 5, 5, 5, 7, 7, 7, 8, 8, 8, 8, 8, 8, 10, 10, 10, 13, 12, 13, 13, 12, 13, 13, 13, 13, 13, 13, 15, 15, 15, 20, 17, 20, 20, 17, 20, 18, 20, 20, 21, 21, 20, 21, 21, 21, 21, 21, 21, 21, 23, 23, 23, 28, 23, 28, 29, 23, 32, 28, 23, 31, 27, 28, 33, 33, 32]

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