Filling a array/matrix without for-loop

array = zeros(1, 20);
for i = 1:20
    array(1,i) = %some formula dependent upon i, e.g. (i-1)*value1*value2/value3  
end

Desired: A way to do it without the for-loop. I know it's probably out there yet but I didn't find it via the google or searching the forum. Sorry for possible duplicate.