# A284747 (b-file synthesized from sequence entry)
1 0
2 1
3 4
4 54
5 1794
6 99990
7 7955460
8 848584800
9 116816051520
10 20167501253760
11 4268024125243200
12 1086711068022148800
13 327759648421871635200
14 115567595710587359539200
15 47104362677165542792243200
16 21978200228619432098036736000
17 11639211300056830532862403584000
18 6943663015969522875618267601920000