Tribonacci Sequence

gistfile1.txt

function tribonacci(signature,n){
console.log(signature);
console.log(n);
  var i;
  var fib = new Array();  
  if (n == 0) return fib; 

  if (n > 3) {
  fib[0] = signature[0];
  fib[1] = signature[1];
  fib[2] = signature[2];

  for (i = 3; i < n; i++)
  fib[i] = fib[i-3] + fib[i-2] + fib[i-1];
  return fib;
  }
  else if (n <= 3) {
  for (i = 0; i < n; i++)
  fib[i] = signature[i];
  return fib;
  }
}