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a(1)=1. For n >=2, a(n) = the smallest positive integer with exactly sum{k=1 to n-1} a(k) divisors.
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%I #7 Mar 11 2014 01:32:33

%S 1,1,2,6,48,805306368

%N a(1)=1. For n >=2, a(n) = the smallest positive integer with exactly sum{k=1 to n-1} a(k) divisors.

%C Next term is 2^402653212 * 3 -- too big for display. [From _Hagen von Eitzen_, Jun 22 2009]

%K nonn

%O 1,3

%A _Leroy Quet_, Jun 18 2009