# A032321 (b-file synthesized from sequence entry)
1 2
2 2
3 12
4 72
5 720
6 6480
7 90720
8 1209600
9 20321280
10 359251200
11 7424524800
12 160465536000
13 3923023104000
14 101213996083200
15 2853345470976000
16 85364982743040000
17 2742350070620160000
18 93039294691639296000