a(n,m) tabl hea(n,m) tabl (triangle) for A067323 n\m 0 1 2 3 4 5 6 7 8 9 ... 0 1 0 0 0 0 0 0 0 0 0 1 2 1 0 0 0 0 0 0 0 0 2 5 3 2 0 0 0 0 0 0 0 3 14 9 7 5 0 0 0 0 0 0 4 42 28 23 19 14 0 0 0 0 0 5 132 90 76 66 56 42 0 0 0 0 6 429 297 255 227 202 174 132 0 0 0 7 1430 1001 869 785 715 645 561 429 0 0 8 4862 3432 3003 2739 2529 2333 2123 1859 1430 0 9 16796 11934 10504 9646 8986 8398 7810 7150 6292 4862 . . . Row sums give A001700: [1, 3, 10, 35, 126, 462, 1716, 6435, 24310, ...] See also A028364 (row reversed triangle) ###################################### e.o.f.##########################################