f:=n->n/(n!)^(1/n);
f(1);
f(2);
f(3);
evalf(f(3));
f(4);
evalf(f(4));
for n from 1 to 10 do
    evalf(f(n));
od;
for n from 1 to 5 do
    evalf(f(10^n));
od;