# A052139 (b-file synthesized from sequence entry)
1 1
2 6
3 18
4 216
5 9720
6 9720
7 1224720
8 29393280
9 18895680
10 1984046400
11 32736765600
12 392841187200
13 183849675609600
14 4211828932147200
15 25738954585344000
16 8339421285651456000
17 21265524278411212800
18 437462213727316377600