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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.

A285588 a(1) = a(2) = 1; a(3) = a(4) = a(5) = 2; a(n) = a(a(n-3)-1) + a(n-a(n-5)-2) for n > 5.

Table of values

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

List of values

[1, 1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 11, 12, 12, 13, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 16, 17, 17, 17, 19, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, 22, 23, 23, 24, 24, 24, 25, 25, 25, 28, 27]

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