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%I #3 Mar 30 2012 16:50:31
%S 2,4,8,22,98,388,16648,132358,1311234,1073743876,17179877384,
%T 274877943814,4398113693698,72083983122432004,3458834890081107976,
%U 110681871838615896070,38686511673635471463677954,2475908412805686633409019908,198070557401964757114570145800
%N {2^n}_{2^n}.
%C See A122618 for notation.
%K nonn,base
%O 1,1
%A _N. J. A. Sloane_, Sep 21 2006