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%I #6 Mar 30 2012 18:39:10
%S 1,1,1,1,1,1,3,4,1,13,13,1,3,12,3,1,13,13,1,4,3,1,1,1,1,1,1,1,1,1,3,4,
%T 1,13,13,1,3,12,3,1,13,13,1,4,3,1,1,1,1,1,1,1,1,1,3,4,1,13,13,1,3,12,
%U 3,1,13,13,1,4,3,1,1,1,1,1,1,1,1,1,3,4,1,13,13,1,3,12,3,1,13,13,1,4,3,1
%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) = denominator of u(n).
%C Sequence is 24-periodic
%F Period is (1, 1, 1, 1, 1, 1, 3, 4, 1, 13, 13, 1, 3, 12, 3, 1, 13, 13, 1, 4, 3, 1, 1, 1)
%Y Cf. A076784.
%K frac,nonn
%O 1,7
%A _Benoit Cloitre_, Nov 24 2002
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