# A330504 (b-file synthesized from sequence entry)
1 1
2 2
3 4
4 24
5 136
6 480
7 4768
8 40320
9 249856
10 4112640
11 39563008
12 319334400
13 6249389056
14 82473431040
15 1044235737088
16 20922789888000
17 355897293438976
18 4408265775513600
19 121616011523719168
20 2757288942600192000
21 31308290669925892096