



2, 5, 6, 8, 10, 13, 14, 17, 18, 20, 23, 24, 26, 29, 30, 32, 34, 37, 38, 41, 42, 44, 46, 49, 50, 53, 54, 56, 59, 60, 62, 64, 67, 68, 71, 72, 74, 77, 78, 80, 82, 85, 86, 89, 90, 92, 95, 96, 98, 101, 102, 104, 106, 109, 110, 113, 114, 116, 118, 121, 122, 125
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OFFSET

1,1


COMMENTS

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


LINKS

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


EXAMPLE

As a word, A284775 = 0100110..., in which 0 is in positions 2,5,6,8,...


MATHEMATICA

s = Nest[Flatten[# /. {0 > {0, 1}, 1 > {0, 0, 1, 1}}] &, {0}, 7]; (* A284775 *)
Flatten[Position[s, 0]]; (* A284776 *)
Flatten[Position[s, 1]]; (* A284777 *)


CROSSREFS

Cf. A284775, A284776.
Sequence in context: A121411 A224889 A047441 * A081083 A288635 A308595
Adjacent sequences: A284774 A284775 A284776 * A284778 A284779 A284780


KEYWORD

nonn,easy


AUTHOR

Clark Kimberling, Apr 14 2017


STATUS

approved



