Index column reverse order

varus14

I have this code:

var t = $('#plasa_orizontala').DataTable( {
        dom: "Bfrtip",
         order: [[ 4, "desc" ]],
          ajax: {
            url: "ajax/plasa-orizontala.php",
            type: "POST"
        },
        columns: [
            { data: null },
            { data: "nume" },
            { data: "albmaro" },
            { data: "foliate" },
            { data: "plasa" },
            { data: "pret" }
        ],
        select: true,
        buttons: [
            { extend: "create", editor: editor },
            { extend: "edit",   editor: editor },
            { extend: "remove", editor: editor} 
        ]
    } );
    
      t.on( 'order.dt search.dt', function () {
        t.column(0, {search:'applied', order:'applied'}).nodes().each( function (cell, i) {
            cell.innerHTML = i+1;
        } );
    } ).draw();
    

The index column is ok but i want to start descending order

not 1, 2, 3, 4... 900
i want if i have 900 records to start 900, 899, 898, 897.... 1

any help is apreciated

if u have solution for server side it would be better