Blink LED on Arduino UNO with fibonacci delay

fib_blink.ino

int ledPin = 13;
int i = 0;

int fib(int initial) {
  if (initial <=1) {
    return initial;
  }
  else {
    return fib(initial-1)+fib(initial-2);
  }
}

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
}

void loop() {

digitalWrite(ledPin, HIGH);
delay(1000);
digitalWrite(ledPin, LOW);
delay(fib(i)*1000);


i++;

}