text: """
  7 kyu: Sum of odd numbers
  http://www.codewars.com/kata/sum-of-odd-numbers/train/python
  """
  
  
  def row_sum_odd_numbers(n):
      start = n ** 2 - (n - 1)
      return sum(range(start, start + n * 2, 2))
  
  
  assert row_sum_odd_numbers(1) == 1
  assert row_sum_odd_numbers(2) == 8
  assert row_sum_odd_numbers(41) == 68921
  