# A377534 (b-file synthesized from sequence entry)
0 1
1 3
2 12
3 78
4 648
5 6300
6 72000
7 939960
8 13749120
9 223035120
10 3969907200
11 76890733920
12 1609732776960
13 36214043785920
14 871131980759040
15 22310233170825600
16 606026217929932800
17 17401756135956192000
18 526641334386809241600
19 16753142420507766873600