> > > Er, fib 0 is ONE, not ZERO. > > > > No it's not. At least, Maple gives 0 for fibonacci(0). Besides that, it > > doesn't really matter if you make it zero, it's just that the whole series > > shifts one number to the right. > > Eh? fib 1 should always be 1. Fibonacci himself wouldn't want it any other > way. :-) It still is. And making fib(0) 0 ensures that fib(2) is also 1. G