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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.

A309430 a(n) = a(n-a(n-1)) + a(n-a(n-4)), with a(n) = ceiling(2*n/3) for n <= 7.

Table of values

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

List of values

[1, 2, 2, 3, 4, 4, 5, 6, 6, 7, 7, 8, 9, 9, 10, 10, 11, 11, 12, 13, 13, 13, 14, 14, 15, 16, 16, 17, 17, 18, 19, 19, 19, 20, 20, 21, 21, 22, 23, 23, 24, 24, 25, 25, 26, 26, 26, 27, 27, 28, 29, 29, 30, 30, 31, 31, 32, 33, 33, 33, 34, 34, 35, 36, 36, 37, 37, 38, 38, 38, 39, 39, 40, 41, 41, 41, 42, 42, 43, 44, 44]

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