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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.

A284511 a(1) = 1, a(2) = 2, a(3) = 2; a(n) = a(a(n-1)-1) + a(n-a(n-2)) for n > 3.

Table of values

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

List of values

[1, 2, 2, 3, 4, 4, 4, 5, 7, 8, 7, 7, 8, 8, 8, 9, 12, 14, 12, 11, 15, 15, 13, 14, 15, 15, 15, 16, 16, 16, 16, 17, 21, 23, 23, 23, 23, 23, 24, 25, 26, 27, 27, 27, 29, 28, 29, 27, 26, 28, 30, 30, 29, 30, 31, 31, 31, 31, 32, 32, 32, 32, 32, 33, 38, 44, 43, 41, 40, 40, 40, 41, 46, 50]

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