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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.

A284644 a(1) = a(2) = 2, a(3) = 1; a(n) = a(n-a(n-1)) + a(n-a(n-2)) for n > 3.

Table of values

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

List of values

[2, 2, 1, 3, 5, 3, 5, 6, 4, 6, 10, 5, 7, 9, 9, 10, 11, 11, 12, 10, 14, 11, 9, 16, 14, 11, 17, 21, 11, 16, 19, 17, 19, 20, 19, 21, 21, 22, 22, 22, 24, 21, 23, 23, 22, 25, 25, 18, 35, 26, 24, 32, 25, 22, 35, 34, 20, 38, 36, 27, 34, 40, 20, 39, 33, 36, 39, 28, 40, 37, 39]

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