# A373433 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 12
4 120
5 1920
6 43920
7 1370880
8 55843200
9 2879815680
10 183330604800
11 14122244505600
12 1294628759424000
13 139287595371724800
14 17379949655535667200
15 2489494639794978816000
16 405724534220435189760000
17 74646464089618378653696000
18 15396938399483145082626048000