Matlab, 44 * 0.5 = 22
===
    function r=f(n);r=[];for i=1:n;r=[i:n,r];end
> f(4) == [4     3     4     2     3     4     1     2     3     4]

Javascript, 63 * 0.5 = 31.5
===

    F=n=>{r=[m=n];while(--n){r=r.slice(0,m-n).concat(n,r)}return r}
> F(4) == [ 4, 3, 2, 1, 4, 3, 2, 4, 3, 4 ]

Nothing fancy, just concatenating arrays.