# A097173 (b-file synthesized from sequence entry)
1 0
2 2
3 0
4 48
5 120
6 4560
7 35700
8 1048992
9 15514128
10 456726240
11 10073339100
12 323266492560
13 9361060088952
14 336767513038320
15 11913610172869860
16 482920107426039360
17 19998225191360977440
18 909512248720724321472