OFFSET
1,2
COMMENTS
a(n) - a(n-1) is in {1,2,3} for n>=2, and a(n)/n -> 6 - 3*sqrt(2).
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..10000
EXAMPLE
As a word, A286801 = 11011001011011001011011..., in which 1 is in positions 1,2,4,5,8,10,...
MATHEMATICA
s = Nest[Flatten[# /. {0 -> {0, 0, 1}, 1 -> {0}}] &, {0}, 16]; (* Pell word, A171588 *)
w = StringJoin[Map[ToString, s]];
w1 = StringReplace[w, {"0" -> "110", "1" -> "010"}];
st = ToCharacterCode[w1] - 48 ; (* A286801 *)
Flatten[Position[st, 0]]; (* A286802 *)
Flatten[Position[st, 1]]; (* A286803 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, May 16 2017
STATUS
approved