# A145622 (b-file synthesized from sequence entry)
1 2
2 12
3 20
4 40
5 72
6 792
7 10296
8 102960
9 583440
10 11085360
11 3695120
12 254963280
13 1274816400
14 11473347600
15 332727080400
16 20629078984800
17 20629078984800
18 20629078984800
19 763275922437600
20 763275922437600
21 31294312819941600