[development] Get the form for a node

[Fernando Conceição]

I have searched a lot, but dont find the right way to do this.
So what i want is to load the form for a node, the same form as if i am 
editing a node, something like:

$node = node_load(1);
$form = get_the_edit_form_for_this_node($node);


I try:

$node = node_load(1);
$form = drupal_get_form('article_node_form', $node);

But the resulting $form do not have the fields and the values for this node.

Thanks for any help.