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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.

A265723 Number of OFF (white) cells in the n-th iteration of the "Rule 1" elementary cellular automaton starting with a single ON (black) cell.

Table of values

n a(n)
0 0
1 3
2 4
3 3
4 8
5 3
6 12
7 3
8 16
9 3
10 20
11 3
12 24
13 3
14 28
15 3
16 32
17 3
18 36
19 3
20 40
21 3
22 44
23 3
24 48
25 3
26 52
27 3
28 56
29 3
30 60
31 3
32 64
33 3
34 68
35 3
36 72
37 3
38 76
39 3
40 80
41 3
42 84
43 3
44 88
45 3
46 92
47 3
48 96
49 3
50 100
51 3
52 104
53 3
54 108
55 3
56 112
57 3
58 116
59 3
60 120
61 3
62 124
63 3
64 128
65 3
66 132
67 3
68 136
69 3
70 140
71 3

List of values

[0, 3, 4, 3, 8, 3, 12, 3, 16, 3, 20, 3, 24, 3, 28, 3, 32, 3, 36, 3, 40, 3, 44, 3, 48, 3, 52, 3, 56, 3, 60, 3, 64, 3, 68, 3, 72, 3, 76, 3, 80, 3, 84, 3, 88, 3, 92, 3, 96, 3, 100, 3, 104, 3, 108, 3, 112, 3, 116, 3, 120, 3, 124, 3, 128, 3, 132, 3, 136, 3, 140, 3]

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