定义：F(n)=((∑i=1nFib(i))+1)(Fib(2n+1)−(∑i=1nFib2(i)))−Fib3(n−1)定义：F(n)=((\sum_{i = 1}^{n} Fib(i))+1)(Fib(2n+1)-(\sum_{i = 1}^{n}Fib^2(i)))-Fib^3(n-1)定义：F(n)=((∑i=1nFib(i))+1)(Fib(2n+1)−(∑i=1nFib2(i)))−Fib3(n−1) Fib(n)$$为斐波那契数列 化简(最简)$$F(n)
