[O] Include results in a table

[abonnements]

Hello everybody,
I have somethink like that

#+call: gen(A)
#+results: A
: 10

#+call: gen(B)
#+results: B
: 20

Is there a simple mean to aggregate the results in a table, i.e to get
| A | 10 |
| B | 20 |

I think some lisp can do that but as a beginner... but as I want to 
learn you can suggest a somewhat complicated solution or a simple idea.
Thanks.