a(n,m) tabl head (triangle) for A112707 n\m 0 1 2 3 4 5 6 7 8 9 ... 0 1 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 2 1 0 1 0 0 0 0 0 0 0 3 1 2 -1 1 0 0 0 0 0 0 4 1 -3 7 -2 1 0 0 0 0 0 5 1 11 -33 16 -3 1 0 0 0 0 6 1 -31 191 -119 29 -4 1 0 0 0 7 1 101 -1153 1015 -291 46 -5 1 0 0 8 1 -328 7295 -9191 3293 -579 67 -6 1 0 9 1 1102 -47617 87037 -39715 8171 -1013 92 -7 1 . . . The (signed) row sums give: A112708: [1,2,2,3,4,-7,68,-285,553,8052,...]. The unsigned row sums give: A112709: [1,2,2,5,14,65,376,2613,20761,184756,...]. #############################################################################################