A267607 Decimal representation of the n-th iteration of the "Rule 181" elementary cellular automaton starting with a single ON (black) cell.

1, 3, 11, 59, 171, 1019, 3051, 15291, 43691, 262139, 786411, 3932091, 11271851, 66845691, 200010731, 1002159035, 2863311531, 17179869179, 51539607531, 257698037691, 738734374571, 4380866640891, 13108240182251, 65678639872955, 187655711009451

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=181; 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[FromDigits[catri[[k]], 2], {k, 1, rows}]   (* Decimal Representation of Rows *)

Crossrefs

Cf. A267605.

Sequence in context: A199854 A242384 A225809 * A375912 A319248 A340865

Adjacent sequences: A267604 A267605 A267606 * A267608 A267609 A267610

Keyword

nonn,easy

Author

Robert Price, Jan 18 2016

Status

approved