# A052743 (b-file synthesized from sequence entry)
0 0
1 1
2 2
3 6
4 48
5 480
6 5040
7 65520
8 1048320
9 18869760
10 377395200
11 8462361600
12 209802700800
13 5666588928000
14 165900288153600
15 5242466541312000
16 177718177308672000
17 6430828699975680000
18 247490157968621568000