# A014767 (b-file synthesized from sequence entry)
1 1
2 2
3 6
4 12
5 60
6 120
7 5040
8 32
9 181440
10 3628800
11 39916800
12 95040
13 3113510400
14 87178291200
15 1307674368000
16 80
17 177843714048000
18 6402373705728000
19 121645100408832000
20 1216451004088320000
21 25545471085854720000