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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.

A316626 a(1)=a(2)=a(3)=1; a(n) = a(n-2*a(n-1))+a(n-1-2*a(n-2)) for n > 3.

Table of values

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

List of values

[1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 8, 8, 8, 8, 8, 8, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 12, 12, 12, 12, 12, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 20, 20]

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