%I #6 Jul 12 2015 20:35:25
%S 1,1,1,2,2,2,2,3,3,4,5,10,86,1499263005586576
%N a(n) = floor((3/2)^^n), where x^^n is the power tower x^(x^(...^x)) with n x's.
%t f[n_] := (3/2)^n; Floor[ NestList[f, 3/2, 12]]
%Y Cf. A014221.
%K nonn
%O 0,4
%A _Robert G. Wilson v_, Mar 26 2003
%E New definition from _Benoit Jubin_, Jul 22 2008
%E Inserted a missing 1 at the beginning, _Benoit Jubin_, Aug 04 2008