# A091019 (b-file synthesized from sequence entry) 0 1 1 12 2 160 3 896 4 18432 5 90112 6 851968 7 1310720 8 142606336 9 637534208 10 5637144576 11 24696061952 12 429496729600 13 1855425871872 14 15942918602752 15 68169720922112 16 1548112371908608 17 3940649673949184 18 166633186212708352