a(n,m) triangle A000369 n\m 1 2 3 4 5 6 7 8 9 10 ... 1 1 0 0 0 0 0 0 0 0 0 2 3 1 0 0 0 0 0 0 0 0 3 21 9 1 0 0 0 0 0 0 0 4 231 111 18 1 0 0 0 0 0 0 5 3465 1785 345 30 1 0 0 0 0 0 6 65835 35595 7650 825 45 1 0 0 0 0 7 1514205 848925 196245 24150 1680 63 1 0 0 0 8 40883535 23586255 5755050 775845 62790 3066 84 1 0 0 9 1267389585 748471185 190482705 27478710 2471175 142506 5166 108 1 0 10 44358635475 26715409875 7034400450 1069801425 104085135 6746355 292320 8190 135 1 . . . The row sums give [1, 4, 31, 361, 5626, 109951, 2585269, 71066626, 2236441141, 79289379361,...] = A016036. The column sequences are A008545, A143167, A143168, A143169, A143170, for m=1..5. ############################################### e.o.f. #####################################################