通用公式:A(x)=1+x+2*x^2+5*x^3+19*x^4+160*x^5+3418*x^6+。。。
对数开始于:
对数(A(x))=x+3*x^2/2+10*x^3/3+55*x^4/4+691*x^5/5+19440*x^6/6+1232750*x^7/7+154436735*x^8/8+41136723397*x^9/9+。。。
等于级数之和:
对数(A(x))=(1+x+x^2)*x
+(1+2^2*x+3^2*x2+2^2*x^3+x^4)*x^2/2
+(1+3^3*x+6^3*x2+7^3*x^3+6^3**x^4+3^3*x^5+x^6)*x^3/3
+(1+4^4*x+10^4*x^2+16^4*x^3+19^4*x^4+16^4*x^5+10^4*x^6+4^4*x^7+x^8)*x^4/4
+(1+5^5*x+15^5**x^2+30^5*x^3+45^5*x2^4+51^5*x ^5+45^5*x^6+30^5*x^7+15^5*x ^8+5^5*x ^9+x^10)*x^5/5+。。。