a(n,m) tabl head (triangle) for  A090441


                        
  n\m      0      1         2            3              4              5             6           7      8      9
 
                         
   -1      1      0         0            0              0              0             0           0      0      0
                            
    0      1      1         0            0              0              0             0           0      0      0
                           
    1      1      1         1            0              0              0             0           0      0      0
                           
    2      1      2         2            1              0              0             0           0      0      0
                           
    3      1      6        12            6              1              0             0           0      0      0
                           
    4      1     24       144          144             24              1             0           0      0      0
                            
    5      1    120      2880         8640           2880            120             1           0      0      0
                           
    6      1    720     86400      1036800        1036800          86400           720           1      0      0
                      
    7      1   5040   3628800    217728000      870912000      217728000       3628800        5040      1      0
             
    8      1  40320 203212800  73156608000  1463132160000  1463132160000   73156608000   203212800  40320      1