# A133360 (b-file synthesized from sequence entry)
9 362880
10 16329600
11 419126400
12 8083152000
13 130456085760
14 1863435974400
15 24359586451200
16 297846188640000
17 3457819037312640
18 38528927611574400
19 415357755774998400
20 4358654246117808000
21 44733116259693227520