%I #25 Mar 24 2012 13:11:37

%S 1,3,19,195,2791,51303,1152019,30564075,935494831,32447734143,

%T 1257770533339,53884306900515,2528224238464471,128934398091500823,

%U 7101273378743303779,420078397130637237915,26563302733186339752511

%N Duplicate of A048172.

%K dead

%O 1,2