# A052793 (b-file synthesized from sequence entry)
0 0
1 0
2 0
3 0
4 0
5 0
6 720
7 5040
8 23520
9 90720
10 312480
11 997920
12 3017520
13 8751600
14 24552528
15 67026960
16 178825920
17 467812800
18 1203094080
19 3048024384
20 7620293520