# A052602 (b-file synthesized from sequence entry)
0 0
1 0
2 2
3 0
4 24
5 120
6 1440
7 15120
8 201600
9 2903040
10 47174400
11 838252800
12 16286054400
13 342486144000
14 7758867916800
15 188305108992000
16 4875010043904000
17 134094160392192000
18 3905447960494080000