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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.

A087817 a(n) = a(a(a(n-1)))+a(n-a(n-1)).

Table of values

n a(n)
0 1
1 1
2 2
3 2
4 3
5 3
6 3
7 4
8 4
9 4
10 4
11 5
12 6
13 6
14 6
15 6
16 6
17 7
18 7
19 8
20 8
21 8
22 8
23 8
24 8
25 9
26 9
27 9
28 10
29 10
30 10
31 10
32 10
33 10
34 10
35 11
36 11
37 11
38 11
39 12
40 13
41 13
42 13
43 13
44 13
45 13
46 13
47 13
48 14
49 14
50 14
51 14
52 14
53 15
54 15
55 16
56 16
57 16
58 16
59 16
60 16
61 16
62 16
63 16
64 17
65 17
66 17
67 17
68 17
69 17
70 18
71 18
72 18
73 19
74 19
75 19
76 19
77 19
78 19

List of values

[1, 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 5, 6, 6, 6, 6, 6, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 12, 13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 17, 17, 17, 18, 18, 18, 19, 19, 19, 19, 19, 19]

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