a(n,m) tabl head (triangle) for A089515 n\m 1 2 3 4 5 6 7 1 1 0 0 0 0 0 0 2 -1 4 0 0 0 0 0 3 1 -24 50 0 0 0 0 4 -1 114 -950 1350 0 0 0 5 31 -15504 400520 -1897200 2052855 0 0 6 -9269 19612560 -1431859000 17333030000 -56265334125 49236404224 0 7 342953 -3011508588 594221485000 -16634292228125 123422029355625 -302409994743808 222337901418633 For row n the denominators D(n):= A089516(n), i.e. [1,1,3,27,513,540702,8891844390,...], qre needed in order to compute the column sequence of triangle A089504.