<prompt> Kuandika Ruby kazi ya mahesabu Catalan mfululizo.  <response>: Sure! Here is a Ruby function that calculates the Catalan sequence:def catalann if n 0 return 1 else return 22n - 1catalann-1n1 endendYou can call this function with an integer n as an argument and it will return the nth number in the Catalan sequence. For example, catalan5 would return 42. 