a(n,k)  tabf head (staircase) for  A007840 (See Blasiak et al. ref. Table 1, case r=3,s=2.)


 n\k       2         3         4         5         6        7        8        9       10   11  12
 
                    
  1        1         0         0         0         0        0        0        0        0    0   0
                    
  2        6         6         1         0         0        0        0        0        0    0   0
                     
  3       72       168        96        18         1        0        0        0        0    0   0
                    
  4     1440      5760      6120      2520       456       36        1        0        0    0   0
                   
  5    43200    259200    424800    285120     92520    15600     1380       60        1    0   0

  6  1814400  15120000  34776000  33566400  16304400  4379760   682200    62400     3270   90   1


  The row length sequence for this tabf array is [1,3,5,7,9,11,...]=A005408(n-1), n>=1.