# A075998 (b-file synthesized from sequence entry)
1 2
2 6
3 8
4 60
5 48
6 336
7 576
8 2160
9 3840
10 25344
11 17280
12 262080
13 322560
14 829440
15 1548288
16 21150720
17 16588800
18 73543680
19 139345920
20 766402560
21 1459814400
22 9157017600
23 4087480320
24 90574848000
25 130427781120
26 361184624640