



2, 3, 5, 7, 9, 12, 13, 15, 18, 19, 21, 24, 25, 27, 30, 32, 33, 35, 37, 39, 42, 43, 45, 48, 50, 51, 53, 55, 57, 60, 61, 63, 66, 68, 69, 71, 73, 75, 78, 79, 81, 84, 86, 87, 89, 92, 93, 95, 97, 99, 102, 103, 105, 108, 109, 111, 114, 115, 117, 120, 122, 123, 125
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OFFSET

1,1


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, A284912 = 011010101..., in which 1 is in positions 2,3,5,7,9,...


MATHEMATICA

s = Nest[Flatten[# /. {0 > {0, 1}, 1 > {1, 0, 1, 0}}] &, {0}, 6] (* A284912 *)
Flatten[Position[s, 0]] (* A284913 *)
Flatten[Position[s, 1]] (* A284914 *)


CROSSREFS

Cf. A284912, A284913.
Sequence in context: A120431 A214548 A254440 * A293262 A200049 A279984
Adjacent sequences: A284911 A284912 A284913 * A284915 A284916 A284917


KEYWORD

nonn,easy


AUTHOR

Clark Kimberling, Apr 17 2017


STATUS

approved



