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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.

A163875 a(n)=n-a(a(n-4)) with a(0)=a(1)=a(2)=a(3)=0.

Table of values

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

List of values

[0, 0, 0, 0, 4, 5, 6, 7, 4, 4, 4, 4, 8, 9, 10, 11, 12, 13, 14, 15, 12, 12, 12, 12, 16, 17, 18, 19, 16, 16, 16, 16, 20, 21, 22, 23, 24, 25, 26, 27, 24, 24, 24, 24, 28, 29, 30, 31, 32, 33, 34, 35, 32, 32, 32, 32, 36, 37, 38, 39, 36, 36, 36, 36, 40, 41, 42, 43, 44, 45, 46, 47, 44, 44]

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