# A050995 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 9
4 144
5 1800
6 64800
7 39690
8 12700800
9 171460800
10 17146080000
11 518668920000
12 2390026383360
13 3606379096320000
14 449813829104640000
15 139161153379248000000
16 4453156908135936000000