%I #7 Mar 30 2012 18:51:19
%S 2,3,9,5,81,7,729,10,27,6561,12,177147,14,1594323,16,14348907,18,
%T 129140163,20,1162261467,22,10460353203,24,94143178827,26,
%U 847288609443,19683,29,22876792454961,31,205891132094649,33,1853020188851841,35
%N Earliest sequence where a(a(n))=3^n.
%H <a href="/index/Aa#aan">Index entries for sequences of the a(a(n)) = 2n family</a>
%e a(7)=a(a(6))=3^6=729
%Y Cf. A038755, A038757.
%K nonn
%O 1,1
%A _Henry Bottomley_, May 03 2000