a(n,m) tabl head (triangle) for  A091042

  n\m      0      1      2      3      4      5      6      7      8      9

    0      1      0      0      0      0      0      0      0      0      0
                          
    1      1      3      0      0      0      0      0      0      0      0
                          
    2      1     10      5      0      0      0      0      0      0      0
                          
    3      1     21     35      7      0      0      0      0      0      0
                          
    4      1     36    126     84      9      0      0      0      0      0
                          
    5      1     55    330    462    165     11      0      0      0      0
                          
    6      1     78    715   1716   1287    286     13      0      0      0
                          
    7      1    105   1365   5005   6435   3003    455     15      0      0
                          
    8      1    136   2380  12376  24310  19448   6188    680     17      0
                          
    9      1    171   3876  27132  75582  92378  50388  11628    969     19