login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A267444 Decimal representation of the middle column of the "Rule 129" elementary cellular automaton starting with a single ON (black) cell. 1
1, 2, 5, 10, 21, 43, 87, 174, 349, 699, 1399, 2799, 5599, 11199, 22399, 44798, 89597, 179195, 358391, 716783, 1433567, 2867135, 5734271, 11468543, 22937087, 45874175, 91748351, 183496703, 366993407, 733986815, 1467973631, 2935947262, 5871894525, 11743789051 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

S. Wolfram, A New Kind of Science, Wolfram Media, 2002; p. 55.

LINKS

Robert Price, Table of n, a(n) for n = 0..1000

Eric Weisstein's World of Mathematics, Elementary Cellular Automaton

S. Wolfram, A New Kind of Science

Index entries for sequences related to cellular automata

Index to Elementary Cellular Automata

MATHEMATICA

rule=129; rows=20; ca=CellularAutomaton[rule, {{1}, 0}, rows-1, {All, All}]; (* Start with single black cell *) catri=Table[Take[ca[[k]], {rows-k+1, rows+k-1}], {k, 1, rows}]; (* Truncated list of each row *) mc=Table[catri[[k]][[k]], {k, 1, rows}]; (* Keep only middle cell from each row *) Table[FromDigits[Take[mc, k], 2], {k, 1, rows}]  (* Binary Representation of Middle Column *)

CROSSREFS

Cf. A267417.

Sequence in context: A032283 A266248 A027437 * A267880 A101510 A066819

Adjacent sequences:  A267441 A267442 A267443 * A267445 A267446 A267447

KEYWORD

nonn,easy

AUTHOR

Robert Price, Jan 15 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 19 20:41 EDT 2019. Contains 323409 sequences. (Running on oeis4.)