# A052656 (b-file synthesized from sequence entry)
0 0
1 1
2 8
3 24
4 192
5 1920
6 23040
7 322560
8 5160960
9 92897280
10 1857945600
11 40874803200
12 980995276800
13 25505877196800
14 714164561510400
15 21424936845312000
16 685597979049984000
17 23310331287699456000