n! -- factor


: n! ( n -- n! ) dup zero? [ drop 1 ] [ dup 1- n! * ] if ;
: ln! ( n lim -- ) over - [ dup n! . 1+ ] times drop ;

1 10 ln!
1
2
6
24
120
720
5040
40320
362880

Superior.

>>11
Assuming you meant 1000000000000!, no you didn't. It'd have like 1000000000000^1000000000000 digits in it. (Well, close enough to not matter.)

If you meant 1!, well okay, but then you're just slow and that must've been one fucking huge 1.