# A052573 (b-file synthesized from sequence entry)
0 2
1 4
2 20
3 168
4 1968
5 29280
6 525600
7 11027520
8 264579840
9 7142929920
10 214280640000
11 7071181286400
12 254561568307200
13 9927888709939200
14 416971151460864000
15 18763699200390144000
16 900657519773147136000