0 th , 1 st and 2 nd number of the series are 1
pPrevPrev , pPrev , pCurr , pNext = 1 , 1 , 1 , 1 NEW_LINE for i in range ( 3 , n + 1 ) : NEW_LINE INDENT pNext = pPrevPrev + pPrev NEW_LINE pPrevPrev = pPrev NEW_LINE pPrev = pCurr NEW_LINE pCurr = pNext NEW_LINE DEDENT return pNext ; NEW_LINE