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%I #5 May 20 2019 21:46:38
%S 1,1,12,60480,871782912000,129260083694424883200000,
%T 516657398319307246483332566876160000000,
%U 120690846038545150966716699071685590652292228448256000000000
%N a(n) = (n^2)!/n!.
%t Table[(n^2)!/(n!), {n, 1, 10}]
%Y Cf. A127224, A127225, A127226.
%K nonn
%O 0,3
%A _Artur Jasinski_, Jan 09 2007
%E a(0) = 1 prepended by _Peter Luschny_, May 20 2019