# A374072 (b-file synthesized from sequence entry)
1 1
2 3
3 12
4 20
5 60
6 360
7 630
8 2520
9 4480
10 20160
11 36288
12 181440
13 1814400
14 3326400
15 19958400
16 239500800
17 444787200
18 3113510400
19 5811886080
20 43589145600
21 81729648000
22 653837184000
23 1302884352000
24 10461394944000
25 19760412672000
26 177843714048000
27 3201186852864000