# A108033 (b-file synthesized from sequence entry)
2 0
3 2
4 40
5 480
6 5280
7 58800
8 685440
9 8467200
10 111283200
11 1556755200
12 23151744000
13 365318553600
14 6102480384000
15 107665189632000
16 2001613565952000
17 39125617090560000
18 802430837784576000
19 17233055891251200000
20 386831419300085760000
21 9060127078449807360000