Given a number of row 'n', generate the following pascal's matrix 'p' where spaces are filled by 'zeros'.

number of row, n = 5

p =

     0     0     0     0     1     0     0     0     0
     0     0     0     1     0     1     0     0     0
     0     0     1     0     2     0     1     0     0
     0     1     0     3     0     3     0     1     0
     1     0     4     0     6     0     4     0     1