# A045509 (b-file synthesized from sequence entry)
1 1
2 120
3 1307674368000
4 121645100408832000
5 1124000727777607680000
6 15511210043330985984000000
7 10888869450418352160768000000
8 10333147966386144929666651337523200000000
9 13763753091226345046315979581580902400000000