a(n,m) tabl head (triangle) for A091044 n\m 0 1 2 3 4 5 6 7 8 9 1 1 0 0 0 0 0 0 0 0 0 2 2 2 0 0 0 0 0 0 0 0 3 3 10 3 0 0 0 0 0 0 0 4 4 28 28 4 0 0 0 0 0 0 5 5 60 126 60 5 0 0 0 0 0 6 6 110 396 396 110 6 0 0 0 0 7 7 182 1001 1716 1001 182 7 0 0 0 8 8 280 2184 5720 5720 2184 280 8 0 0 9 9 408 4284 15912 24310 15912 4284 408 9 0 10 10 570 7752 38760 83980 83980 38760 7752 570 10