a(n,m) tabl head (triangle) for  A091543



   n\m    0             1               2              3            4          5        6      7      8      9
 
                           
   1      1             0               0              0            0          0        0      0      0      0
                           
   2      2             1               0              0            0          0        0      0      0      0
                             
   3      4             6               1              0            0          0        0      0      0      0
                            
   4      8            72              12              1            0          0        0      0      0      0
                           
   5     16          1440             360             20            1          0        0      0      0      0
                             
   6     32         43200           20160           1120           30          1        0      0      0      0
                           
   7     64       1814400         1814400         123200         2700         42        1      0      0      0
                        
   8    128     101606400       239500800       22422400       491400       5544       56      1      0      0
                   
   9    256    7315660800     43589145600     6098892800    150368400    1507968    10192     72      1      0
           
  10    512  658409472000  10461394944000  2317579264000  69470200800  696681216  3872960  17280     90      1