%I #3 Sep 21 2014 14:09:15
%S 1,5,21,85,317,1157
%N A246335(2^n-1).
%C Mysteriously different from A002450.
%Y Cf. A246333, A246334, A246335, A002450.
%K nonn,more
%O 0,2
%A _N. J. A. Sloane_, Sep 21 2014
