# A091549 (b-file synthesized from sequence entry)
2 1
3 28
4 960
5 43200
6 2520000
7 186278400
8 17069875200
9 1902071808000
10 253487646720000
11 39833773056000000
12 7291173820170240000
13 1538106259064094720000
14 370502654756909875200000