> Is there some trick to get it recomputed, other that keep a list of all 
> dependent values, and "refresh" the table whenever some value is updated?

This is not what the general concept of laziness is about.

You need something different.

-- 
regards,               tf@cip.physik.uni-muenchen.de              (o_
 Thomas Fischbacher -  http://www.cip.physik.uni-muenchen.de/~tf  //\
(lambda (n) ((lambda (p q r) (p p q r)) (lambda (g x y)           V_/_
(if (= x 0) y (g g (- x 1) (* x y)))) n 1))                  (Debian GNU)

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