# A036070 (b-file synthesized from sequence entry) 0 1 1 10 2 80 3 560 4 3584 5 21504 6 122880 7 675840 8 3604480 9 18743296 10 95420416 11 477102080 12 2348810240 13 11408506880 14 54760833024 15 260113956864 16 1224065679360 17 5712306503680 18 26456998543360 19 121702193299456