# A339300 (b-file synthesized from sequence entry)
1 1
2 0
3 6
4 36
5 540
6 8400
7 169680
8 3966480
9 107518320
10 3295283040
11 112888369440
12 4272403544640
13 177061349424960
14 7974538914101760
15 387840385867334400
16 20257533315635616000
17 1130954856127948051200
18 67208532822729871372800
19 4235759061057115720128000