# A052646 (b-file synthesized from sequence entry)
0 1
1 2
2 8
3 42
4 288
5 2400
6 23760
7 272160
8 3548160
9 51891840
10 841881600
11 15008716800
12 291711974400
13 6139842508800
14 139136552755200
15 3377722892544000
16 87457261731840000
17 2405869763641344000