# A052605 (b-file synthesized from sequence entry)
0 0
1 1
2 0
3 0
4 24
5 120
6 720
7 10080
8 120960
9 1451520
10 21772800
11 359251200
12 6227020800
13 118313395200
14 2440992153600
15 53614649088000
16 1255367393280000
17 31300493672448000
18 825906208038912000