# A213640 (b-file synthesized from sequence entry)
1 1
2 2
3 12
4 132
5 2040
6 40560
7 986160
8 28344960
9 940222080
10 35350378560
11 1485586206720
12 69006955691520
13 3510875174526720
14 194162144086310400
15 11597083480958976000
16 744005639375065267200
17 51024015181398702643200
18 3725042532308649628876800
19 288434288836744276094668800