# A082042 (b-file synthesized from sequence entry)
0 1
1 2
2 10
3 60
4 408
5 3120
6 26640
7 252000
8 2620800
9 29756160
10 366508800
11 4869849600
12 69455232000
13 1058593536000
14 17174123366400
15 295534407168000
16 5377157001216000
17 103149354147840000
18 2080771454361600000