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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.

A071995 a(1) = 1, a(2) = 0, a(n) = a(floor(n/3)) + a(n - floor(n/3)).

Table of values

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

List of values

[1, 0, 1, 2, 3, 2, 3, 2, 3, 4, 3, 4, 5, 6, 7, 6, 7, 6, 7, 8, 9, 10, 9, 8, 9, 8, 9, 10, 11, 12, 13, 14, 13, 12, 11, 12, 13, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 20, 19, 18, 19, 18, 19, 18, 19, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 29, 30, 29, 28, 27, 26, 27, 28, 27, 26]

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