how obtain automatic row numbers in a table starting after the second hline?

[Uwe Brauer]

Hi

I would like to obtain 
#+begin_src 

|  Nr |
|-----|
|     |
|-----|
| 574 |
| 575 |
|  .. |
| 680 |
#+end_src

I tried 
#+begin_src 

| Nr |
|----|
|  1 |
|----|
|  1 |
|  2 |
#+TBLFM: $1=vlen(@II$1..0);EN
#+end_src

or
#+begin_src 

|  Nr |
|-----|
| 573 |
|-----|
| 574 |
| 575 |
#+TBLFM: $1=@#-1+572
#+end_src

None worked, any ideas?

thanks

Uwe Brauer 
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