



2, 3, 4, 5, 7, 8, 9, 11, 12, 13, 15, 16, 17, 18, 20, 21, 22, 24, 25, 26, 28, 29, 30, 31, 33, 34, 35, 37, 38, 39, 41, 42, 43, 44, 46, 47, 48, 50, 51, 52, 54, 55, 56, 58, 59, 60, 61, 63, 64, 65, 67, 68, 69, 71, 72, 73, 74, 76, 77, 78, 80, 81, 82, 84, 85, 86
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OFFSET

1,1


COMMENTS

Conjecture: 1 < n*r  a(n) < 4 for n >= 1, where r = (1+sqrt(13))/2.


LINKS

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


MATHEMATICA

s = Nest[Flatten[# /. {0 > {1}, 1 > {0, 1, 1, 1}}] &, {0}, 6] (* A284674 *)
Flatten[Position[s, 0]] (* A284675 *)
Flatten[Position[s, 1]] (* A284676 *)


CROSSREFS

Cf. A284674, A284675, A284679.
Sequence in context: A039117 A185024 A247915 * A187681 A107750 A196736
Adjacent sequences: A284673 A284674 A284675 * A284677 A284678 A284679


KEYWORD

nonn,easy


AUTHOR

Clark Kimberling, Apr 08 2017


STATUS

approved



