a(n,m) tabl head (triangle) for  A064879

   n\m     0       1       2       3       4       5       6       7       8       9 ...
        
                        
   0       1       0       0       0       0       0       0       0       0       0

   1       1       1       0       0       0       0       0       0       0       0

   2       0       1       1       0       0       0       0       0       0       0

   3       0       2       1       1       0       0       0       0       0       0

   4       0       5       4       1       1       0       0       0       0       0

   5       0      14      28       6       1       1       0       0       0       0

   6       0      42     256      81       8       1       1       0       0       0

   7       0     132    2704    1566     176      10       1       1       0       0

   8       0     429   31168   36126    5888     325      12       1       1       0

   9       0    1430  380608  921456  238848   16750     540      14       1       1
 
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  Row sums give A064880:  [1,2,2,4,11,50,389,4590,73950,1559648,...]


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