# A048800 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 12
4 120
5 1800
6 37440
7 1023120
8 35360640
9 1502323200
10 76738233600
11 4629350880000
12 325036115712000
13 26238156161817600
14 2409994778846054400
15 249634150247978496000
16 28935351060849192960000
17 3727654806346921562112000
18 530531863561703729037312000