# A052608 (b-file synthesized from sequence entry)
0 1
1 1
2 6
3 42
4 408
5 4920
6 71280
7 1204560
8 23264640
9 505491840
10 12203654400
11 324084499200
12 9388910361600
13 294668851276800
14 9959509521561600
15 360665744414976000
16 13931586106454016000
17 571775010100310016000