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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.

A087834 a[n] =a[a[a[n-1]]] + a[n -1- a[n-2]].

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 4
14 4
15 5
16 5
17 5
18 5
19 5
20 5
21 6
22 7
23 7
24 7
25 7
26 7
27 7
28 7
29 8
30 9
31 9
32 9
33 9
34 9
35 9
36 9
37 9
38 9
39 10
40 11
41 11
42 11
43 11
44 11
45 11
46 11
47 11
48 11
49 11
50 11
51 12
52 13
53 13
54 13
55 13
56 13
57 13
58 13
59 13
60 13
61 13
62 13
63 13
64 13
65 14
66 15
67 15
68 15
69 15
70 15
71 15
72 15
73 15
74 15
75 15
76 15
77 15
78 15
79 15
80 15
81 16
82 17

List of values

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

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