a(n,m) tabl head (triangle) for  A090435


  n\m       1           2              3                 4                 5                  6                 7        

   1        1           0              0                 0                 0                  0                 0        
                  
   2       -1           6              0                 0                 0                  0                 0        
                 
   3        1         -48            147                 0                 0                  0                 0        
                  
   4       -5        1584         -24255             50176                 0                  0                 0        
                   
   5        1       -1980         121275          -1003520           1571724                  0                 0        
             
   6      -41      496980     -113458275        2950635520      -16174611684        20412000000                 0        
    
   7    45182 -3322062810  2744728561050  -206756932157440  3081396966348393 -12443694076800000 13160600037440625