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%I #4 Mar 30 2012 17:20:57
%S 1,1,1,1,1,1,1,1,3,23,135,599,2187,6947,19899,52667,131109,311525,
%T 717525,1635781,3802461,9332573,24773869,70874381,212534247,646664443,
%U 1949536667,5749101579,16503012263,46118290863
%N Recip transform of 2*(1 + x^2 + x^4 + x^6)-1/(1-x).
%C Sign diagram of generating sequence: +-+-+-+--------...
%K nonn
%O 0,9
%A _Olivier Gérard_
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