Числа Фибоначчи в Seed7

$ include "seed7_05.s7i";

const func integer: fibonacci (in var integer: n) is func
result
    var integer: result is 1;
begin
    if n < 2 then
        result := 1;
    else
        result := fibonacci(n - 1) + fibonacci(n - 2);
    end if;
end func;

const proc: main is func
local
    var integer: n is 0;
begin
    for n range 0 to 15 do
        write(fibonacci(n) <& ", ");
    end for;
    writeln("...");
end func;