# A087918 (b-file synthesized from sequence entry)
1 1
2 3
3 21
4 210
5 6510
6 234360
7 29763720
8 4047865920
9 2068459485120
10 1092146608143360
11 2235624106869457920
12 4650098142288472473600
13 38088953883484878031257600
14 314462403262051153026062745600
15 10303989567687630131204997985075200
16 338960040818652280796119613717033779200