PL/SQL Fibonacci Sequence

Write a PL/SQL code to get the Fibonacci Sequence.

First, I will explain what is Fibonacci Sequence and how to get this series.
So, Fibonacci Sequence is a series of numbers 0,1,1,2,3,5,8,13,21.............

In Fibonacci Sequence, first and second elements are 0 and 1 and to get the next elements we will add the previous elements and it will generate the next element.
So, first element=0
      second element =1
      third element=sum of last 2 elements (first element + second element)
                           =0+1
                           =1
      fourth element=second element + third element
                             =1+1
                             =2
      fifth element=third element + fourth element
                           =1+2
                           =3

So in this way we can generate a Fibonacci Sequence.

Program Code:

SQL> declare
  2  a number(5);
  3  b number(5);
  4  c number(5);
  5  n number(5);
  6  i number(5);
  7  begin
  8  n:=6;
  9  a:=0;
 10  b:=1;
 11  for i in 1..n
 12  loop
 13  c:=a+b;
 14  a:=b;
 15  b:=c;
 16   dbms_output.put_line(c);
 17  end loop;
 18  end;

 19  /

Thanks.