Since you are mentioning OLE and DDE, you want to display content of that HTML file live in Writer and be able to update it in Writer when table.html change?
I would do it like this (although it may not be the best way): Insert → Section… Name a section (text box on the left). Check ‘Link’ on the right of textbox with table name. Click Browse and navigate to a html file. Click Insert.
Now, when you update html file and you want to update it in Writer, choose Tools → Update → Updat all (or just Links or what ever is that you want to update).
[EDIT] I just noticed that you can insert that HTML table as OLE object but not trough Insert → Object → OLE object menu.
Instead do Insert → Frame → Floating frame. Name it, click ‘Browse’ and navigate to the HTML table. Click OK.
To resize this new OLE object, press F5 for Navigator to pop-up. Double click on your object under OLE object category and grab one of those green handles to resize.