# A371017 (b-file synthesized from sequence entry)
1 20
2 520
3 5880
4 48720
5 341880
6 2162160
7 12732720
8 71179680
9 382444920
10 1991669680
11 10113543440
12 50297301600
13 245807780400
14 1183546677600
15 5626112450400
16 26447537160000
17 123113285479800
18 568139770321200
19 2601623487262800
20 11830908080191200
21 53465154668125200
22 240246019677549600