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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.

A005707 a(1) = a(2) = a(3) = a(4) = 1, a(n) = a(a(n-1))+a(n-a(n-1)) for n >= 5.

Table of values

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

List of values

[1, 1, 1, 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 6, 6, 6, 6, 6, 7, 8, 8, 9, 9, 9, 9, 9, 9, 10, 11, 11, 12, 12, 12, 13, 13, 13, 13, 13, 13, 13, 14, 15, 16, 16, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, 19, 19, 19, 19, 20, 21, 22, 22, 23, 24, 24, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, 27]

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