%I #10 Dec 07 2019 12:18:24
%S 2,120,40320,39916800,87178291200,355687428096000,2432902008176640000,
%T 25852016738884976640000,403291461126605635584000000,
%U 8841761993739701954543616000000,263130836933693530167218012160000000
%N a(n) = (3*n-1)!.
%p seq( (3*n-1)!,n=1..13);
%o (Sage) [stirling_number1(3*n,1) for n in range(1, 22)] # _Zerinvary Lajos_, Nov 26 2009
%K nonn
%O 1,1
%A _Jorge Coveiro_, Dec 26 2004
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