a(n,m) tabl head (triangle) for  A051150
 
    n\m            1             2             3            4           5          6         7       8     9  10
 
    1              1             0             0            0           0          0         0       0     0   0
    2             -5             1             0            0           0          0         0       0     0   0
    3             50           -15             1            0           0          0         0       0     0   0
    4           -750           275           -30            1           0          0         0       0     0   0
    5          15000         -6250           875          -50           1          0         0       0     0   0
    6        -375000        171250        -28125         2125         -75          1         0       0     0   0
    7       11250000      -5512500       1015000       -91875        4375       -105         1       0     0   0
    8     -393750000     204187500     -41037500      4230625     -245000       8050      -140       1     0   0
    9    15750000000   -8561250000    1845687500   -210262500    14030625    -567000     13650    -180     1   0
   10  -708750000000  401006250000  -91617187500  11307500000  -841640625   39545625  -1181250   21750  -225   1

    etc.