a(n)=(n!)^(3*n^2)*产品{i=1..n,j=1.n,k=1..n}(1+1/(i*j*k))。
a(n)~exp(3*n^2*log(Gamma(n+1))+(Gamma+PolyGammaA001620号和c=A307106型=和{k>=2}(-1)^k*泽塔(k)^3/k=1.8369219085953783265640880112170343162564662453544904457。。。
a(n)~(2*Pi)^(3*n^2/2)*exp(-3*n^3+n/4+(log(n))^3+3*gamma*(log。
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