



1, 4, 5, 8, 9, 11, 13, 16, 17, 20, 21, 23, 25, 28, 29, 31, 34, 35, 37, 40, 41, 44, 45, 47, 49, 52, 53, 56, 57, 59, 61, 64, 65, 67, 70, 71, 73, 76, 77, 80, 81, 83, 85, 88, 89, 91, 94, 95, 98, 99, 101, 103, 106, 107, 109, 112, 113, 116, 117, 119, 121, 124, 125
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

2n  a(n) is in {0,1} for n >=1.


LINKS

Clark Kimberling, Table of n, a(n) for n = 1..10000


EXAMPLE

As a word, A284905 = 011001..., in which 0 is in positions 1,4,5,8,9,...


MATHEMATICA

s = Nest[Flatten[# /. {0 > {0, 1}, 1 > {1, 0, 0, 1}}] &, {0}, 6] (* A284905 *)
Flatten[Position[s, 0]] (* A284906 *)
Flatten[Position[s, 1]] (* A284907 *)


CROSSREFS

Cf. A284905, A284907.
Sequence in context: A042956 A128217 A288671 * A285260 A190671 A042948
Adjacent sequences: A284903 A284904 A284905 * A284907 A284908 A284909


KEYWORD

nonn,easy


AUTHOR

Clark Kimberling, Apr 17 2017


STATUS

approved



