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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.

A090639 a(0) = 0; a(2n) = 3*a(n), a(2n+1) = a(n) + 1.

Table of values

n a(n)
0 0
1 1
2 3
3 2
4 9
5 4
6 6
7 3
8 27
9 10
10 12
11 5
12 18
13 7
14 9
15 4
16 81
17 28
18 30
19 11
20 36
21 13
22 15
23 6
24 54
25 19
26 21
27 8
28 27
29 10
30 12
31 5
32 243
33 82
34 84
35 29
36 90
37 31
38 33
39 12
40 108
41 37
42 39
43 14
44 45
45 16
46 18
47 7
48 162
49 55
50 57
51 20
52 63
53 22
54 24
55 9
56 81
57 28
58 30
59 11
60 36
61 13
62 15
63 6
64 729
65 244
66 246
67 83
68 252
69 85
70 87
71 30
72 270
73 91

List of values

[0, 1, 3, 2, 9, 4, 6, 3, 27, 10, 12, 5, 18, 7, 9, 4, 81, 28, 30, 11, 36, 13, 15, 6, 54, 19, 21, 8, 27, 10, 12, 5, 243, 82, 84, 29, 90, 31, 33, 12, 108, 37, 39, 14, 45, 16, 18, 7, 162, 55, 57, 20, 63, 22, 24, 9, 81, 28, 30, 11, 36, 13, 15, 6, 729, 244, 246, 83, 252, 85, 87, 30, 270, 91]

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