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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.

A071991 a(1) = a(2) = 1; a(n) = a(floor(n/3)) + a(n - floor(n/3)).

Table of values

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

List of values

[1, 1, 2, 3, 4, 4, 5, 5, 6, 7, 7, 8, 9, 10, 11, 11, 12, 12, 13, 14, 15, 16, 16, 16, 17, 17, 18, 19, 20, 21, 22, 23, 23, 23, 23, 24, 25, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 34, 34, 34, 35, 35, 36, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 49, 50, 50, 50, 50]

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