Well, I'd argue that *not* outputting zero isn't quite right. Usually, the Fibonacci sequence is defined as F(0) = 0; F(1) = 1; F(n) = F(n-1) + F(n-2), n > 1. See for instance Sloane: The On-Line Encyclopedia of Integer Sequences
and Graham, Knuth and Patashnik in Concrete Mathematics
. Eric Weisstein
defines the sequence as starting with F(1) = F(2) = 1 and then states it's conventional to define F(0) = 0.
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