# A131978 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 4
5 4
6 24
7 24
8 192
9 1728
10 17280
11 17280
12 207360
13 207360
14 414720
15 6220800
16 99532800
17 696729600
18 12541132800
19 12541132800
20 250822656000
21 5267275776000
22 10534551552000
23 10534551552000
24 252829237248000
25 1264146186240000
26 12641461862400000
27 3754514173132800000