OFFSET
1,2
COMMENTS
Conjecture: a(n)/n -> 2.
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..10000
EXAMPLE
As a word, A285533 = 110100111..., in which 0 is in positions 1,2,4,7,8,...
MATHEMATICA
s = Nest[Flatten[# /. {0 -> {1, 1}, 1 -> {0, 1, 0, 0}}] &, {0}, 9] (* A285533 *)
Flatten[Position[s, 0]] (* A285534 *)
Flatten[Position[s, 1]] (* A285535 *)
Position[SubstitutionSystem[{0->{1, 1}, 1->{0, 1, 0, 0}}, {0}, {5}][[1]], 1]//Flatten (* Harvey P. Dale, Aug 10 2024 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Apr 30 2017
STATUS
approved