Sum of odd numbers

function rowSumOddNumbers(n) {
  let startValue = n * (n - 1) + 1;
  let sum = 0;
  for (let i = 1; i <= n; i++) {
    if (i == 1) {
      sum = startValue
    } else {
      startValue = startValue + 2;
      sum = sum + startValue;
    }
  }
  return sum;
}
console.log(rowSumOddNumbers(4));