# A337793 (b-file synthesized from sequence entry)
1 2
2 16
3 144
4 9216
5 57600
6 14515200
7 203212800
8 65028096000
9 1580182732800
10 421382062080000
11 6373403688960000
12 38546345510830080000
13 310206304349061120000
14 212801524783455928320000
15 47880343076277583872000000