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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.

A226222 a(1) = a(2) = a(3) = 1, a(n) = a(n-2-a(n-2)) + a(n-1-a(n-3)) for n>3.

Table of values

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

List of values

[1, 1, 1, 2, 2, 3, 3, 3, 4, 5, 5, 5, 6, 6, 7, 7, 8, 9, 9, 9, 10, 10, 11, 11, 11, 12, 13, 13, 13, 14, 15, 16, 16, 16, 17, 18, 18, 18, 18, 19, 20, 21, 21, 21, 21, 22, 22, 23, 23, 24, 25, 25, 25, 26, 26, 27, 27, 28, 29, 30, 30, 30, 31, 32, 32, 32, 32, 33, 35, 35]

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