In Stanley, EC2, we have the following statement:

I think there is a typo in the first sum after "generating function", and that $[n]_q!$ should be replaced by $(1-q)(1-q^2)\dotsb (1-q^n)$, and same for $[n]_t!$.

The problem with the proof seems to be the line

which is incorrect(?) as the denominator on the right hand side should be not the q/t-factorials, but the above product, according to the lemma which is referenced there.

This issue (if my suspicions hold), is not listed in the Errata..

I have also checked this in Mathematica, so I am fairly confident this is a typo.

$(n)!$(in boldface---MO displays all math in boldface, which doesn't work so well for my notation). $\endgroup$2more comments