[1,1,2,4,16,60,288,1584,10368,74880,604800, 5356800,51840000,544320000,6147187200,74579097600, 962415820800,13241346048000,192255565824000, 2957575348224000,47721518530560000, 811595019755520000,14407079038894080000, 268390402745794560000]