著名的Fibonacci数列，定义如下

f(1)=1,f(2)=1,f(n)=f(n-1)+f(n-2)，n>2

用文字来说，就是斐波那契数列由 0 和 1 开始，之后的斐波那契系数就由之前的两数相加。首几个斐波那契系数是：

0, 1, 1, 2, 3, 5, 8, 13, 21-The famous Fibonacci sequence, defined as f (1) = 1, f (2) = 1, f (n) = f (n-1)+f (n-2), n>　2 words, it is the Fibonacci Fibonacci sequence starts from 0 and 1, then Fibonacci coefficients from the previous two numbers together. First few Fibonacci coefficients are: 0, 1, 1, 2, 3, 5, 8, 13, 21