# A070734 (b-file synthesized from sequence entry)
3 3
4 24
5 60
6 720
7 2520
8 40320
9 181440
10 3628800
11 19958400
12 479001600
13 3113510400
14 87178291200
15 653837184000
16 20922789888000
17 177843714048000
18 6402373705728000
19 60822550204416000
20 2432902008176640000