nmax=22;系数列表[Series[Product[1/(1-x^k)^(Exp[-x]/k),{k,1,nmax}],{x,0,nmax{],x]Range[0,nmax]!
nmax=22;系数列表[Series[Exp[Exp[-x]Sum[DivisorSigma[0,k]x^k/k,{k,1,nmax}]],{x,0,nmax{],x]Range[0,nmax]!
A002744号[n_]:=和[(-1)^(n-k)二项式[n,k]除数Sigma[0,k](k-1)!,{k,1,n}];a[0]=1;a[n]:=a[n]=和[二项式[n-1,k-1]A002744号[k] a[n-k],{k,1,n}];表[a[n],{n,0,22}]
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