a(n,m) tabl head (triangle) for  A104472
 
    n\m     1       2       3       4       5       6       7       8       9      10 ...
 
    1       1       0       0       0       0       0       0       0       0       0
    2       2       4       0       0       0       0       0       0       0       0
    3       3       5       8       0       0       0       0       0       0       0
    4       4       8      11      15       0       0       0       0       0       0
    5       5       9      12      16      21       0       0       0       0       0
    6       6      12      18      22      27      33       0       0       0       0
    7       7      13      19      23      28      34      41       0       0       0
    8       8      16      22      30      35      41      48      56       0       0
    9       9      17      26      34      39      45      52      60      69       0
   10      10      20      29      37      47      53      60      68      77      87
    .
    .
    .

The sequence for n=m (main diagonal) this  is the sequence A024916(n): 

[1, 4, 8, 15, 21, 33, 41, 56, 69, 87, 99, 127, 141, 165, 189, 220, 238, 277, 297, 339,...]