# A353822 (b-file synthesized from sequence entry)
1 0
2 1
3 2
4 9
5 24
6 110
7 720
8 5985
9 39200
10 343224
11 3628800
12 41295870
13 479001600
14 6130959120
15 87104969952
16 1318070979225
17 20922789888000
18 354344089779680
19 6402373705728000
20 121882240625961816
21 2432849766865689600
22 51041049953430700800
23 1124000727777607680000