a(n,k) tabl head (triangle) for  A235943



   n\k             0            1            2           3          4         5         6        7       8       9    10    11    12    13

   0               0            0            0           0          0         0         0        0       0       0     0     0     0     0
   1               0            0            0           0          0         0         0        0       0       0     0     0     0     0
   2               0            0            0           0          0         0         0        0       0       0     0     0     0     0
   3               0            0            0           6          0         0         0        0       0       0     0     0     0     0
   4              16            0            0           0          8         0         0        0       0       0     0     0     0     0
   5              60           50            0           0          0        10         0        0       0       0     0     0     0     0
   6             456          144          108           0          0         0        12        0       0       0     0     0     0     0
   7            3458         1078          294         196          0         0         0       14       0       0     0     0     0     0
   8           29296         7936         2240         512        320         0         0        0      16       0     0     0     0     0
   9          275166        66096        16200        4104        810       486         0        0       0      18     0     0     0     0
  10         2843980       611200       135600       29200       6900      1200       700        0       0       0    20     0     0     0
  11        32108164      6248682      1250414      247566      48400     10890      1694      968       0       0     0    22     0     0
  12       393499248     69926976     12776976     2285568     417384     75456     16368     2304    1296       0     0     0    24     0
  13      5205200806    850848414    142879360    23421372    3866720    663494    112216    23660    3042    1690     0     0     0    26