import Cocoa func fibonacci(n: Int) -> Int { let square_root_of_5 = sqrt(5.0) let p = (1 + square_root_of_5) / 2 let q = 1 / p return Int((pow(p,CDouble(n)) + pow(q,CDouble(n))) / square_root_of_5 + 0.5) } for i in 1...30 { println(fibonacci(i)) }