# A052666 (b-file synthesized from sequence entry)
0 1
1 1
2 8
3 42
4 456
5 4800
6 69840
7 1093680
8 20482560
9 420577920
10 9736070400
11 245887488000
12 6806133734400
13 203555082931200
14 6565920180019200
15 226728504946944000
16 8355118608764928000
17 327047476385710080000