Computing fib(10)...
Computing fib(9)...
Computing fib(8)...
Computing fib(7)...
Computing fib(6)...
Computing fib(5)...
Computing fib(4)...
Computing fib(3)...
Computing fib(2)...
Computing fib(1)...
Computing fib(0)...
fib(10) = 55
Computing fib(12)...
Computing fib(11)...
fib(12) = 144
