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a(n) is the smallest number with at least as many divisors as a(n-1)^2.
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%I #9 Mar 17 2022 02:48:44

%S 2,4,12,120,7560,8648640,1927522396800,4747472432036420486400,

%T 128438082648984172330026178330296384000,

%U 6184173455628205993842062057864303743050691444602955105860128640000

%N a(n) is the smallest number with at least as many divisors as a(n-1)^2.

%F a(n) = A061799(A048691(a(n-1))). - _R. J. Mathar_, Jan 21 2009

%e 4^2 = 16 has 5 divisors; the smallest number with at least 5 divisors is 12.

%K nonn

%O 1,1

%A _J. Lowell_, Jan 16 2009

%E a(6)-a(10) from _Donovan Johnson_, May 09 2009