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Positions of 0 in A284490; complement of A284492.
5

%I #6 Apr 05 2017 07:43:21

%S 3,4,7,8,13,14,17,18,21,22,25,26,31,32,35,36,41,42,45,46,49,50,53,54,

%T 59,60,63,64,69,70,73,74,79,80,83,84,89,90,93,94,97,98,101,102,107,

%U 108,111,112,117,118,121,122,125,126,129,130,135,136,139,140,145

%N Positions of 0 in A284490; complement of A284492.

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

%H Clark Kimberling, <a href="/A284491/b284491.txt">Table of n, a(n) for n = 1..10000</a>

%t s = Nest[Flatten[# /. {0 -> {1}, 1 -> {0, 0, 1, 1}}] &, {0}, 15]; (* A284490 *)

%t Flatten[Position[s, 0]]; (* A284491 *)

%t Flatten[Position[s, 1]]; (* A284492 *)

%Y Cf. A284488, A284490, A284492.

%K nonn,easy

%O 1,1

%A _Clark Kimberling_, Apr 04 2017