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%I #4 Mar 30 2012 17:20:57
%S 1,1,3,9,31,111,415,1591,6229,24773,99795,406225,1668071,6900295,
%T 28725759,120243143,505751889,2136282633,9057752963,38534668209,
%U 164439768551,703658271103,3018625303199,12979441615631,55926921211749
%N Recip transform of 2*(1 + x^3 + x^4 + x^5)-1/(1-x).
%C Sign diagram of generating sequence: +--+++---------...
%K nonn
%O 0,3
%A _Olivier Gérard_