. mata
: function fib(n) {
        return((((1+sqrt(5))/2):^n-((1-sqrt(5))/2):^n)/sqrt(5))
}

: fib(0..10)
        1    2    3    4    5    6    7    8    9   10   11
    +--------------------------------------------------------+
  1 |   0    1    1    2    3    5    8   13   21   34   55  |
    +--------------------------------------------------------+

: end