RosettaCodeData/Task/Ackermann-function/DWScript/ackermann-function.dw

function Ackermann(m, n : Integer) : Integer;
begin
    if m = 0 then
        Result := n+1
    else if n = 0 then
        Result := Ackermann(m-1, 1)
    else Result := Ackermann(m-1, Ackermann(m, n-1));
end;