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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A289000 Length of n-th iterate of the mapping 00->0010, 01->001, 10->001, starting with 00. 3
2, 4, 7, 12, 20, 34, 58, 99, 169, 288, 491, 837, 1428, 2437, 4159, 7099, 12118, 20686, 35312, 60280, 102903, 175665, 299877, 511920, 873900, 1491838, 2546724, 4347527, 7421690, 12669614, 21628381, 36921953, 63029713, 107598447, 183682035, 313564844, 535288668 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..36.

MATHEMATICA

z = 20; (* number of iterates *)

s = {0, 0}; w[0] = StringJoin[Map[ToString, s]];

w[n_] := StringReplace[w[n - 1], {"00" -> "0010", "01" -> "001", "10" -> "001"}]

TableForm[Table[w[n], {n, 0, 10}]]

Table[StringLength[w[n]], {n, 0, 20}] (* A289000 *)

CROSSREFS

Cf. A288991, A288997.

Sequence in context: A172524 A094925 A289168 * A289028 A186537 A079970

Adjacent sequences:  A288997 A288998 A288999 * A289001 A289002 A289003

KEYWORD

nonn,easy

AUTHOR

Clark Kimberling, Jun 25 2017

EXTENSIONS

a(27)-a(36) from Lars Blomberg, Jul 05 2017

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 12:27 EDT 2019. Contains 323393 sequences. (Running on oeis4.)