注意100次项系数～
f(x) = ∑
= (x+x^2) + 2x^3 + (1/2!)(x^5+x^4) + (1/3!)(x^7+x^5) + (1/4!)(x^9+x^6)
+ (1/5!)(x^11+x^7) + (1/6!)(x^13+x^8) + (1/7!)(x^15+x^9) + (1/8!)(x^17+x^10)
+... + (1/n!)x^(n+1)(x^n+x) + ...
f^(10)(0) = 10!/8! = 90
稍后，
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