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A050080 a(n) = floor(a(n-1)/3) if this is not among 0, a(1), ..., a(n-2); otherwise a(n) = 4*a(n-1). 6

%I #12 Oct 05 2019 11:26:47

%S 1,4,16,5,20,6,2,8,32,10,3,12,48,192,64,21,7,28,9,36,144,576,2304,768,

%T 256,85,340,113,37,148,49,196,65,260,86,344,114,38,152,50,200,66,22,

%U 88,29,116,464,154,51,17,68,272,90,30,120,40,13

%N a(n) = floor(a(n-1)/3) if this is not among 0, a(1), ..., a(n-2); otherwise a(n) = 4*a(n-1).

%H Ivan Neretin, <a href="/A050080/b050080.txt">Table of n, a(n) for n = 1..10000</a>

%t Rest@Nest[Append[#, If[FreeQ[#, r = Quotient[#[[-1]], 3]], r, 4 #[[-1]]]] &, {0, 1}, 56] (* _Ivan Neretin_, Jul 31 2016 *)

%Y Cf. A050000 and references therein.

%K nonn

%O 1,2

%A _Clark Kimberling_

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