# A129587 (b-file synthesized from sequence entry)
1 4
2 29
3 191
4 1354
5 10634
6 92700
7 892548
8 9430416
9 108630864
10 1356063840
11 18245210400
12 263298142080
13 4057825368960
14 66527793642240
15 1156298057913600
16 21239191491840000
17 411134620109875200
18 8365635747476582400