# A168649 (b-file synthesized from sequence entry)
1 2
2 6
3 168
4 16320
5 6710880
6 11453201760
7 80421421917312
8 2305843008676823040
9 268650182136584246132736
10 126765060022822827559679531520
11 241677817415439249618874010960062464
12 1858395433210885261794249658823668075069440