a(n,m) tabl head (triangle) for  A089503


n\m       1       2       3       4        5         6          7           8          9

  1       1       0       0       0        0         0          0           0          0
                          
  2       1       4       0       0        0         0          0           0          0
                           
  3       1      12      30       0        0         0          0           0          0
                           
  4       1      24     168     336        0         0          0           0          0
                          
  5       1      40     540    2880     5040         0          0           0          0
                         
  6       1      60    1320   13200    59400     95040          0           0          0   
                         
  7       1      84    2730   43680   360360   1441440    2162160           0          0
                         
  8       1     112    5040  117600  1528800  11007360   40360320    57657600          0
                      
  9       1     144    8568  274176  5140800  57576960  374250240  1283143680 1764322560