A053848 - OEIS

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A053848 as a simple table

n	a(n)
1	2
2	20
3	1640
4	901424
5	1333386848
6	9762556479680
7	552311189659544960
8	178664076508334107310336
9	177339376736100844376103875072
10	928195308949863753322027981355832320
11	37279296908672313898400994512625009709475840

[2,20,1640,901424,1333386848,9762556479680, 552311189659544960,178664076508334107310336, 177339376736100844376103875072, 928195308949863753322027981355832320, 37279296908672313898400994512625009709475840]