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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.

A266379 Binary representation of the n-th iteration of the "Rule 21" elementary cellular automaton starting with a single ON (black) cell.

Table of values

n a(n)
0 1
1 11
2 0
3 1111111
4 0
5 11111111111
6 0
7 111111111111111
8 0
9 1111111111111111111
10 0
11 11111111111111111111111
12 0
13 111111111111111111111111111
14 0
15 1111111111111111111111111111111
16 0
17 11111111111111111111111111111111111
18 0
19 111111111111111111111111111111111111111

List of values

[1, 11, 0, 1111111, 0, 11111111111, 0, 111111111111111, 0, 1111111111111111111, 0, 11111111111111111111111, 0, 111111111111111111111111111, 0, 1111111111111111111111111111111, 0, 11111111111111111111111111111111111, 0, 111111111111111111111111111111111111111]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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