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%I #2 Mar 30 2012 16:51:15
%S 1,1681,67637281,15442193173681,11735529528739490881,
%T 22427641105413135505628881,90592214447886493688036507587681,
%U 687051872949101429716075902637226327281,8977220765593827294384825469501847565263767681,189320918307961834904462117789058282666933576006788881
%N A bisection of A002439.
%K nonn
%O 0,2
%A _N. J. A. Sloane_, Nov 07 2009