# A076234 (b-file synthesized from sequence entry)
1 1
2 6
3 120
4 672
5 30240
6 32760
7 33550336
8 459818240
9 1379454720
10 8589869056
11 31998395520
12 51001180160
13 137438691328
14 153003540480
15 30823866178560
16 796928461056000
17 6088728021160320
18 212517062615531520