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+% To my surprise, there has been no Prolog implementation submitted so far. 
+% To get the ball rolling, and to pay respect to Prolog, here is a well-known Prolog implementation of the Fibonacci sequence.
+
+% fib(N, S): S is the Nth Fibonacci number. 
+
+:- table fib/2. 
+
+fib(0, 1) :- !. 
+fib(1, 1) :- !. 
+fib(N, S) :- N > 1, 
+             N1 is N-1, 
+             N2 is N-2, 
+             fib(N1, S1), 
+             fib(N2, S2), 
+             S is S1+S2.