# A109576 (b-file synthesized from sequence entry)
0 0
1 1
2 -6
3 54
4 -552
5 6840
6 -97200
7 1577520
8 -28667520
9 578067840
10 -12798777600
11 308836281600
12 -8065907942400
13 226719600307200
14 -6824229456844800
15 219010610827008000
16 -7465397891567616000
17 269363867734241280000
18 -10256545055212904448000