%I A014222
%S A014222 0,1,3,27,7625597484987
%N A014222 a(0) = 0; thereafter, a(n+1) = 3^a(n).
%C A014222 Next term begins and ends 12580...39387 and has 3638334640025 digits 
               [From Shawn Ligocki (sligocki(AT)gmail.com), Oct 08 2009]
%Y A014222 Cf. A014221, A081561, A114561.
%Y A014222 Sequence in context: A068221 A068222 A055777 this_sequence A162414 A071107 
               A146072
%Y A014222 Adjacent sequences: A014219 A014220 A014221 this_sequence A014223 A014224 
               A014225
%K A014222 nonn,easy
%O A014222 0,3
%A A014222 N. J. A. Sloane (njas(AT)research.att.com).