# A052610 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 18
4 120
5 840
6 9360
7 115920
8 1491840
9 22861440
10 395539200
11 7304774400
12 148011494400
13 3281639961600
14 77850214041600
15 1975895970048000
16 53666956062720000
17 1547595999645696000
18 47204701332332544000