# A052731 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 6
4 48
5 600
6 8640
7 151200
8 3064320
9 71124480
10 1857945600
11 54007430400
12 1729195776000
13 60483053030400
14 2294881337548800
15 93889711948032000
16 4120492394962944000
17 193100926276177920000
18 9624765220305371136000