OFFSET
1,2
COMMENTS
Conjecture: a(n)/n -> 2.
LINKS
Robert Israel, Table of n, a(n) for n = 1..10000
EXAMPLE
As a word, A285530 = 01000100..., in which 0 is in positions 1,3,4,5,7,...
MAPLE
f:= proc(i) if i=0 then (1, 1) else (0, 1, 0, 0) fi end proc:
S:= [0]:
while numboccur(0, S) < 10000 do
S:= map(f, map(f, S))
od:
ListTools:-SearchAll(0, S); # Robert Israel, Nov 04 2019
MATHEMATICA
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Clark Kimberling, Apr 30 2017
STATUS
approved