# A348796 (b-file synthesized from sequence entry)
2 6
3 128
4 3780
5 163840
6 8828820
7 587202560
8 45821335560
9 4133906022400
10 421946699674500
11 48151737348915200
12 6070544859205827000
13 838225443769915801600
14 125787689149526729325000
15 20385642792484352294912000
16 3548258423062128985899690000
17 660168656191813264718430208000
18 130746565669943973430227429382500
19 27463016097579431812286696652800000
20 6098023559259606741021710317037175000