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%I #21 Jan 06 2016 17:18:39
%S 1,2,274,118124,105258076,159721605680,369012649234384,
%T 1206647803780373360,5304713715525445812976,
%U 30180059720580991603896800,215760462268683520394805979744,1893448925578239663637174767335168,20012008248418194052035539503977759232
%N a(n) = Abs(StirlingS1(3*n,n)).
%F a(n) ~ n^(2*n) * c^(3*n) * 3^(5*n) / (sqrt(6*Pi*(c-1)*n) * exp(2*n) * (3*c-1)^(2*n)), where c = -LambertW(-1,-exp(-1/3)/3) = 2.237147027773716818...
%p seq(abs(Stirling1(3*n,n)), n=0..20);
%t Table[Abs[StirlingS1[3*n, n]],{n,0,20}]
%Y Cf. A187646, A242676, A217913.
%K nonn,easy
%O 0,2
%A _Vaclav Kotesovec_, May 20 2014
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