# A181814 (b-file synthesized from sequence entry)
1 1
2 2
3 12
4 24
5 720
6 720
7 151200
8 302400
9 1814400
10 1814400
11 4191264000
12 4191264000
13 125863657920000
14 125863657920000
15 125863657920000
16 251727315840000
17 128509312009478400000
18 128509312009478400000
19 1246500488605217541696000000