>> hw021
  Enter value of N: 6
  Enter value of K: 0
>> hw021
  Enter value of N: 6
  Enter value of K: 0
  C(6,0) = 1
>> hw021
  Enter value of N: 6
  Enter value of K: 1
  C(6,1) = 6
>> hw021
  Enter value of N: 6
  Enter value of K: 2
  C(6,2) = 15
>> hw021
  Enter value of N: 6
  Enter value of K: 3
  C(6,3) = 20
>> hw021
  Enter value of N: 6
  Enter value of K: 4
  C(6,4) = 15
>>