# A053848 (b-file synthesized from sequence entry)
1 2
2 20
3 1640
4 901424
5 1333386848
6 9762556479680
7 552311189659544960
8 178664076508334107310336
9 177339376736100844376103875072
10 928195308949863753322027981355832320
11 37279296908672313898400994512625009709475840