# A003692 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 16
4 120
5 1170
6 14070
7 201600
8 3356640
9 63730800
10 1359666000
11 32212857600
12 839350512000
13 23860289653200
14 734964075846000
15 24388126963200000
16 867393811956672000
17 32919980214689568000