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A129096 A bisection of A129095: a(n) = A129095(2n-1) for n>=1. 5

%I #13 Mar 10 2020 18:00:41

%S 1,3,5,11,13,23,29,51,53,79,89,135,141,199,221,323,325,431,457,615,

%T 625,803,849,1119,1125,1407,1465,1863,1885,2327,2429,3075,3077,3727,

%U 3833,4695,4721,5635,5793,7023,7033,8283,8461,10067,10113,11811,12081,14319

%N A bisection of A129095: a(n) = A129095(2n-1) for n>=1.

%C b(n)=A129095(n) obeys the recurrence: b(n) = b(n/2) (n even), b(n) = 2*b(n-1) + b(n-2) (n odd >1), with b(1) = 1.

%H Michael De Vlieger, <a href="/A129096/b129096.txt">Table of n, a(n) for n = 1..10000</a>

%H William J. Keith, Augustine O. Munagi, <a href="https://arxiv.org/abs/1912.11148">Binary compositions and semi-Pell compositions</a>, arXiv:1912.11148 [math.CO], 2019.

%t With[{s = Nest[Append[#1, If[EvenQ[#2], #1[[#2/2]], 2 #1[[-1]] + #1[[-2]] ] ] & @@ {#, Length@ # + 1} &, {1}, 192]}, Table[s[[i]], {i, 1, Floor[Length[s]/2], 2}]] (* _Michael De Vlieger_, Mar 10 2020 *)

%Y Cf. A129095, A129097, A129098, A129099.

%K easy,nonn

%O 1,2

%A _Paul D. Hanna_, Apr 11 2007

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Last modified April 23 07:16 EDT 2024. Contains 371905 sequences. (Running on oeis4.)