# A052733 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 6
4 24
5 240
6 3600
7 70560
8 1693440
9 47900160
10 1556755200
11 57081024000
12 2328905779200
13 104589041356800
14 5124863026483200
15 272011960636416000
16 15543540607795200000
17 951264685197066240000
18 62070020709108572160000