# A325617 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 2
4 4
5 20
6 105
7 840
8 3960
9 51480
10 675675
11 10810800
12 139675536
13 2793510720
14 58663725120
15 1799020903680
16 26985313555200
17 782574093100800
18 25992639520848000
19 857757104187984000
20 30021498646579440000
21 1563341744336692320000
22 64179292662243158400000