# A174197 (b-file synthesized from sequence entry)
1 4
2 6
3 24
4 30
5 720
6 168
7 720
8 2520
9 151200
10 55440
11 665280
12 1310400
13 47520
14 454053600
15 2471040
16 3598560
17 4410806400
18 1769644800
19 801964800
20 1150269120
21 2283240960