# A334224 (b-file synthesized from sequence entry)
1 2
2 6
3 60
4 420
5 2520
6 27720
7 360360
8 360360
9 12252240
10 232792560
11 232792560
12 5354228880
13 26771144400
14 80313433200
15 2329089562800
16 72201776446800
17 144403552893600
18 144403552893600
19 5342931457063200