Exercise 1.12: The following pattern of numbers
is called 
Pascal’s triangle.


         1
       1   1
     1   2   1
   1   3   3   1
 1   4   6   4   1
       . . .


The numbers at the edge of the triangle are all 1, and each number inside the
triangle is the sum of the two numbers above it.35 Write a procedure that computes elements of Pascal’s triangle by
means of a recursive process.