%I #7 Mar 30 2012 18:51:19
%S 3,8,2,256,6,32,9,4,128,11,1024,13,4096,15,16384
%N Earliest sequence where a(a(n))=2^n.
%H <a href="/index/Aa#aan">Index entries for sequences of the a(a(n)) = 2n family</a>
%e a(9)=a(a(7))=2^7=128, a(16)=a(2^4)=a(a(a(4)))=a(a(256))=2^256>10^77
%Y Cf. A038756, A038757.
%K nonn
%O 1,1
%A _Henry Bottomley_, May 03 2000