OFFSET
1,1
COMMENTS
Conjecture: a(n)/n -> 2.
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..10000
EXAMPLE
As a word, A285530 = 01000100..., in which 1 is in positions 2,6,9,10,12,...
MATHEMATICA
s = Nest[Flatten[# /. {0 -> {1, 1}, 1 -> {0, 1, 0, 0}}] &, {0}, 8] (* A285530 *)
Flatten[Position[s, 0]] (* A285531 *)
Flatten[Position[s, 1]] (* A285532 *)
Position[SubstitutionSystem[{0->{1, 1}, 1->{0, 1, 0, 0}}, {0}, {6}][[1]], 1]// Flatten (* Harvey P. Dale, Feb 20 2022 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Apr 30 2017
STATUS
approved