``` function fun(n) { let arr = [] if (n == 1 || n == 2) { arr.push(1) return arr } else { var a = 1 var b = 1 var c = a + b arr = [1, 1] for (let i = 2; i < n; i++) { arr.push(c) a = b b = c c = a + b } return arr } } console.log(fun(1)) console.log(fun(2)) console.log(fun(3)) console.log(fun(4)) console.log(fun(5)) console.log(fun(6)) ```