a(n,k) tabl head (triangle) for  A112500

   n\k     1       2       3       4       5       6       7       8       9      10 ...
                                

   0       1       0       0       0       0       0       0       0       0       0
 
   1       1       1       0       0       0       0       0       0       0       0

   2       1       4       1       0       0       0       0       0       0       0

   3       1      11      10       1       0       0       0       0       0       0

   4       1      26      60      20       1       0       0       0       0       0

   5       1      57     282     225      35       1       0       0       0       0

   6       1     120    1149    1882     665      56       1       0       0       0

   7       1     247    4272   13070    9107    1666      84       1       0       0

   8       1     502   14932   79872  100751   35028    3696     120       1       0

   9       1    1013   49996  444902  957197  584325  113428    7470     165       1
   .
   .
   .



  Row sums: A112501:

  [1, 2, 6, 23, 108, 601, 3874, 28448, 234903, 2158498,...]


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