# A052613 (b-file synthesized from sequence entry)
0 1
1 0
2 2
3 6
4 72
5 720
6 10080
7 156240
8 2822400
9 56972160
10 1280966400
11 31654022400
12 853580851200
13 24932991283200
14 784343085926400
15 26435945023488000
16 950417730662400000
17 36304660098330624000
18 1468365202287599616000