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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A267445 Number of ON (black) cells in the n-th iteration of the "Rule 129" elementary cellular automaton starting with a single ON (black) cell. 1
1, 0, 1, 0, 5, 3, 5, 0, 13, 11, 13, 7, 17, 11, 13, 0, 29, 27, 29, 23, 33, 27, 29, 15, 41, 35, 37, 23, 41, 27, 29, 0, 61, 59, 61, 55, 65, 59, 61, 47, 73, 67, 69, 55, 73, 59, 61, 31, 89, 83, 85, 71, 89, 75, 77, 47, 97, 83, 85, 55, 89, 59, 61, 0, 125, 123, 125 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

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

FORMULA

Conjecture: a(n) = A071050(n), n>0. - R. J. Mathar, Jan 17 2016

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 *) Table[Total[catri[[k]]], {k, 1, rows}] (* Number of Black cells in stage n *)

CROSSREFS

Cf. A267417.

Sequence in context: A275836 A019172 A133658 * A071050 A271780 A176036

Adjacent sequences:  A267442 A267443 A267444 * A267446 A267447 A267448

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 August 23 00:59 EDT 2019. Contains 326211 sequences. (Running on oeis4.)