x*exp(x)的初始n次迭代开始:
n=0:(1)*x;
^1 x 1+2+n)*!+x^4/3!+x^5/4!+x^6/5!+...
n=2:x+2*x^2+(6)*x^3/2!+23*x^4/3!+104*x^5/4!+537*x^6/5!+...
n=3:x+3*x^2+15*x^3/2!+(102)*x^4/3!+861*x^5/4!+8598*x^6/5!+...
n=4:x+4*x^2+28*x^3/2!+274*x^4/3!+(3400)*x^5/4!+50734*x^6/5!+...
n=5:x+5*x^2+45*x^3/2!+575*x^4/3!+9425*x^5/4!+(187455)*x^6/5!+...
n=6:x+6*x^2+66*x^3/2!+1041*x^4/3!+21216*x^5/4!+527631*x^6/5!+(15441636)*x^7/6!+...
这个序列从上面的系数开始。
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