# A331660 (b-file synthesized from sequence entry)
1 1
2 1
3 5
4 32
5 280
6 3280
7 49480
8 927560
9 21037640
10 566134160
11 17803754560
12 646052181520
13 26757321804880
14 1252934215973600
15 65791336312915520
16 3846554938702140320
17 248841434876849499040
18 17713758333248102781760
19 1380631354206969100115200