Calculate the nth Fibonacci number,return sequence
Given n, return f where f = fib(n) and f(1) = 1, f(2) = 1, f(3) = 2, ...
in this time,return a function handle
f = fib(n)
generate the sequence from the n-th item
if n = 3
first call:
f() = 2
second call
f() = 3
third call
f() = 5
if n = 7
first call:
f() = 13
second call
f() = 21
third call
f() = 34
but, loop and conditional statement is forbidden
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