# A365980 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 2
4 0
5 24
6 80
7 720
8 5376
9 53760
10 490752
11 6289920
12 68766720
13 1024607232
14 13520332800
15 226177695744
16 3498759290880
17 65257155624960
18 1153246338220032
19 23793010526453760
20 472374431008948224
21 10686755493583257600
22 235406405307208826880