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%I #8 May 27 2018 19:51:00
%S 1,1,1,3,4,7,13,13,1,12,12,3,13,91,13,3,12,12,1,13,13,7,4,3,1,1,1,3,4,
%T 7,13,13,1,12,12,3,13,91,13,3,12,12,1,13,13,7,4,3,1,1,1,3,4,7,13,13,1,
%U 12,12,3,13,91,13,3,12,12,1,13,13,7,4,3,1,1,1,3,4,7,13,13,1,12,12,3,13
%N Let u(1)=u(2)=u(3)=1, u(n)=(2^floor(u(n-1)/2)+2^floor(u(n-2)/2)+1)/u(n-3) then a(n) = numerator of u(n).
%C Sequence is 24-periodic
%F Period is (1, 1, 1, 3, 4, 7, 13, 13, 1, 12, 12, 3, 13, 91, 13, 3, 12, 12, 1, 13, 13, 7, 4, 3)
%t PadRight[{},120,{1,1,1,3,4,7,13,13,1,12,12,3,13,91,13,3,12,12,1,13,13,7,4,3}] (* _Harvey P. Dale_, May 27 2018 *)
%Y Cf. A076785.
%K frac,nonn
%O 1,4
%A _Benoit Cloitre_, Nov 24 2002
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