[1,20,180,1264,7808,44544,240640,1249280,6291456,
30932992,149159936,707788800,3313500160,
15334375424,70262980608,319169757184,
1438814044160,6442450944000,28673201668096,
126924873531392,559101662724096,2451910929940480,
10709243254538240,46601700831657984]
|