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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.

A061420 a(n) = a(ceiling((n-1)*2/3)) + 1 with a(0) = 0.

Table of values

n a(n)
0 0
1 1
2 2
3 3
4 3
5 4
6 4
7 4
8 5
9 5
10 5
11 5
12 6
13 6
14 6
15 6
16 6
17 6
18 7
19 7
20 7
21 7
22 7
23 7
24 7
25 7
26 7
27 8
28 8
29 8
30 8
31 8
32 8
33 8
34 8
35 8
36 8
37 8
38 8
39 8
40 8
41 9
42 9
43 9
44 9
45 9
46 9
47 9
48 9
49 9
50 9
51 9
52 9
53 9
54 9
55 9
56 9
57 9
58 9
59 9
60 9
61 9
62 10
63 10
64 10
65 10
66 10
67 10
68 10
69 10
70 10
71 10
72 10
73 10
74 10
75 10
76 10
77 10
78 10
79 10
80 10
81 10
82 10
83 10
84 10
85 10
86 10
87 10
88 10
89 10

List of values

[0, 1, 2, 3, 3, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10]

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