a(n,m) tabl head (triangle) for A091043 n\m 0 1 2 3 4 5 6 7 8 9 1 1 0 0 0 0 0 0 0 0 0 2 1 1 0 0 0 0 0 0 0 0 3 3 10 3 0 0 0 0 0 0 0 4 1 7 7 1 0 0 0 0 0 0 5 5 60 126 60 5 0 0 0 0 0 6 3 55 198 198 55 3 0 0 0 0 7 7 182 1001 1716 1001 182 7 0 0 0 8 1 35 273 715 715 273 35 1 0 0 9 9 408 4284 15912 24310 15912 4284 408 9 0 10 5 285 3876 19380 41990 41990 19380 3876 285 5