# A110348 (b-file synthesized from sequence entry)
1 1
2 1
3 8
4 45
5 504
6 5040
7 86400
8 1247400
9 28828800
10 544864320
11 15850598400
12 370507737600
13 12996271411200
14 362038989312000
15 14867734494412800
16 480878287553664000
17 22629566473113600000
18 833522365093017600000