# A047728 (b-file synthesized from sequence entry)
1 1
2 672
3 30240
4 23569920
5 45532800
6 14182439040
7 153003540480
8 403031236608
9 13661860101120
10 154345556085770649600
11 143573364313605309726720
12 352338107624535891640320
13 680489641226538823680000