# A082035 (b-file synthesized from sequence entry) 0 1 1 7 2 42 3 258 4 1752 5 13320 6 113040 7 1063440 8 11007360 9 124467840 10 1527724800 11 20237817600 12 287879961600 13 4377595622400 14 70875950745600 15 1217444836608000 16 22115388911616000 17 423623726862336000 18 8534364149735424000