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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.

A140473 a(n) = a(floor(2*n/3)) + a(floor(n/3)), a(0) = 0, a(1) = 1.

Table of values

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

List of values

[0, 1, 1, 2, 2, 3, 3, 3, 4, 5, 5, 5, 6, 6, 7, 8, 8, 8, 9, 9, 9, 10, 10, 11, 12, 12, 12, 14, 14, 14, 14, 14, 15, 15, 15, 16, 18, 18, 18, 18, 18, 20, 21, 21, 21, 22, 22, 22, 23, 23, 23, 23, 23, 24, 27, 27, 27, 27, 27, 27, 27, 27, 29, 31, 31, 31, 31, 31, 32, 33, 33, 33, 35, 35, 35, 35]

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