The first Fibonacci numbers a


0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584 …


1.In cell A2 type a zero ( 0 ) and press the Enter key.


2.In cell B2 type a 1 and press the Enter key.


3.In cell C2 type the formula =A2 + B2 and press the Enter key.


4.Click on cell C2


To copy the formula to the adjacent cells:


5.Place the mouse pointer over the fill handle in the bottom right corner of cell C2.


6.Hold down the mouse button on the fill handle and drag to the right to cell S2.


7.S2 should contain the number 2584.


8.To continue the Fibonacci numbers, continue dragging to the right with the fill handle.


alternatively try this link:
http://www.eggheadcafe.com/software/...nacci-num.aspx


all the best