a(n,m) tabl head (triangle) for A090210 (triangle of generalized Bell-numbers) n\m 1 2 3 4 5 6 7 8 9 0 1 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 2 2 1 1 0 0 0 0 0 0 3 5 7 1 1 0 0 0 0 0 4 15 87 34 1 1 0 0 0 0 5 52 1657 2971 209 1 1 0 0 0 6 203 43833 513559 163121 1546 1 1 0 0 7 877 1515903 149670844 326922081 12962661 13327 1 1 0 8 4140 65766991 66653198353 1346634725665 363303011071 1395857215 130922 1 1