I tried these commands
p1 : (1 + x + y + E)^18$
p2 : (1 + a + b + F)^18$
rez:length(ratexpand(p1*p2))$
but Maxima does not return any result.
The processor is active for about 40 seconds, then stops abruptly without any error message to display. This is normal, or is something wrong with my Maxima installation?
I tried the same operations in other CAS systems. For example Reduce returns in about 1-2s the result of 1768900 terms, so the calculation itself seems to be not that heavy.