# A145610 (b-file synthesized from sequence entry)
1 2
2 12
3 20
4 280
5 2520
6 27720
7 360360
8 720720
9 4084080
10 15519504
11 5173168
12 356948592
13 8923714800
14 80313433200
15 2329089562800
16 144403552893600
17 13127595717600
18 13127595717600
19 485721041551200
20 485721041551200