a(n,k)  tabf head (staircase) for  A092077

  
   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             56              16              1             0            0           0         0         0      0    0   0
                      
   3          10192            4928            776            48            1           0         0         0      0    0   0
                      
   4        3872960         2477440         575680         63360         3536          96         1         0      0    0   0
                  
   5     2517424000      1940556800      572868800      86163840      7326880      364800     10480       160      1    0   0
    
   6  2497284608000   2210343116800   773352966400  143430604800  15836206400  1099612800  49056960   1398400  24520  240   1
                                                                     

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