# A144345 (b-file synthesized from sequence entry)
0 1
1 6
2 52
3 600
4 8680
5 151200
6 3082240
7 71998080
8 1896294400
9 55601145600
10 1796277683200
11 63397990656000
12 2427084884224000
13 100175046107136000
14 4434284662872064000
15 209554432423784448000
16 10530302071553904640000
17 560682451860226375680000