



2, 3, 4, 9, 10, 11, 13, 14, 15, 17, 18, 19, 21, 22, 23, 28, 29, 30, 35, 36, 37, 42, 43, 44, 49, 50, 51, 53, 54, 55, 57, 58, 59, 61, 62, 63, 68, 69, 70, 72, 73, 74, 76, 77, 78, 80, 81, 82, 87, 88, 89, 91, 92, 93, 95, 96, 97, 99, 100, 101, 106, 107, 108, 110
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OFFSET

1,1


COMMENTS

Conjecture: a(n)/n > (7 + sqrt(13))/6.


LINKS

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


EXAMPLE

As a word, A284680 = 1000111100010001000..., in which 0 is in positions 2,3,4,9,...


MATHEMATICA

s = Nest[Flatten[# /. {0 > {1}, 1 > {1, 0, 0, 0}}] &, {0}, 8] (* A284680 *)
Flatten[Position[s, 0]] (* A284681 *)
Flatten[Position[s, 1]] (* A284682 *)


CROSSREFS

Cf. A283980, A283982.
Sequence in context: A047454 A081870 A165315 * A309346 A047339 A250483
Adjacent sequences: A284678 A284679 A284680 * A284682 A284683 A284684


KEYWORD

nonn,easy


AUTHOR

Clark Kimberling, Apr 11 2017


STATUS

approved



