# A375831 (b-file synthesized from sequence entry)
0 1
1 0
2 0
3 6
4 0
5 60
6 1080
7 840
8 80640
9 982800
10 5292000
11 249812640
12 2854051200
13 46711304640
14 1595483809920
15 22132648137600
16 649972279756800
17 19151306772998400
18 377272414943424000
19 14076577060273728000
20 407012458114918656000
21 11429334092933569612800