# A294521 (b-file synthesized from sequence entry)
0 1
1 12
2 44
3 704
4 73920
5 320320
6 9929920
7 89369280
8 3664140480
9 84275231040
10 1432678927680
11 1432678927680
12 87393414588480
13 87393414588480
14 6204932435782080
15 14736714534982440
16 132630430814841960
17 5703108525038204280
18 5703108525038204280
19 18249947280122253696
20 1843244675292347623296