%I #22 Mar 11 2014 11:16:48

%S 1,1,7,73,1051,19381,436087,11585953,354981571,12322179901,

%T 477938035807,20485584143113,961567521142411,49054912287659461,

%U 2702571588828034567,159911968233095867953,10114120854154243738771,680943323845807848142861

%N Duplicate of A048174.

%K dead

%O 1,3

%A _N. J. A. Sloane_, Dec 16 2000