a(n,m) tabl head (triangle) for  A092083  s2(7)
 
    n\m            1              2             3             4           5        6        7        8     9   10
 
    1              1              0             0             0           0        0        0        0     0    0
    
    2             21              1             0             0           0        0        0        0     0    0
    
    3            546             42             1             0           0        0        0        0     0    0
    
    4          15561           1533            63             1           0        0        0        0     0    0
    
    5         466830          54054          2961            84           1        0        0        0     0    0
    
    6       14471730        1885338        124740          4830         105        1        0        0     0    0
    
    7      458960580       65542932       4977882        236880        7140      126        1        0     0    0
    
    8    14801478705     2277656901     192582117      10661301      399735     9891      147        1     0    0
    
    9   483514971030    79211114190    7307010945     455183820    20046915   622566    13083      168     1    0
   
   10 15955994043990  2758196430990  273663108576   18763201314   937252701 34440525   914634    16716   189    1
  
   etc.