# A187739 (b-file synthesized from sequence entry)
0 1
1 5
2 39
3 432
4 6156
5 106920
6 2187000
7 51438240
8 1366787520
9 40474546560
10 1321374902400
11 47140942464000
12 1824354473356800
13 76113765702374400
14 3405263691641011200
15 162618715070203392000
16 8256027072794941440000
17 444024146933226123264000
18 25217509310311152586752000